Bacillus thuringiensis, 34040-34045 [2010-14330]
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ethylene oxide blends containing
HCFC–22, this section lists: (1)
Sterilants that EPA previously found
acceptable as substitutes for ethylene
oxide blends containing HCFC–22; and
(2) sterilants that EPA is newly finding
acceptable as substitutes for ethylene
oxide blends containing HCFC–22.
At the end of the decision for the end
use, there is narrative comparing
environmental, flammability, and
toxicity information of the newly
acceptable alternative with other
currently or potentially available
alternatives. Flammable and highly
reactive sterilants are hazardous waste
when disposed. Sterilants must be
registered by EPA under the Federal
Insecticide, Fungicide, and Rodenticide
Act (FIFRA) prior to use. Also,
requirements of the Food and Drug
Administration for medical devices
apply to equipment using sterilants.
More environmental and health
information is also available in the
original SNAP rule of March 18, 1994,
the notice of acceptability in which each
substitute was first listed, or the sector
table for each of the acceptable
alternatives to ethylene oxide blends
containing HCFC–22, in the sterilant
end use. The sector table is available at
https://www.epa.gov/ozone/snap/
sterilants/. The sector table
also includes further identification
information (including composition and
trade names) for each substitute.
1. EPA previously found the following
acceptable as substitutes for ethylene
oxide blends containing HCFC–22 as
sterilants:
• IoGasTM Sterilant Blends 1, 3, and
6 (blends of CF3I/CO2/EtO)
• Mini-Max® Cleaner
2. EPA is newly finding the following
acceptable as substitutes for ethylene
oxide blends containing HCFC–22 as
sterilants:
• CO2/EtO
• Hydrogen peroxide gas plasma
systems
• Peroxyacetic acid/hydrogen
peroxide gas plasma systems
• Pure EtO
• Steam
The newly listed substitutes for
HCFC–22, HCFC–142b, and blends
thereof listed above in section VII.A.2.
are non-ozone-depleting, in contrast to
HCFC–22 blends. They are comparable
to other acceptable substitutes for
HCFC–22 blends in their lack of risk for
ozone depletion. The newly listed
substitutes have GWPs of one or less,
comparable to or lower than that of
other substitutes for HCFC–22 blends.
For example, the GWP of the IoGas
blends is less than one.
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Peroxyacetic acid and ethylene oxide
are considered VOCs under CAA
regulations (see 40 CFR 51.100(s))
addressing the development of SIPs to
attain and maintain the national
ambient air quality standards. Ethylene
oxide is a hazardous air pollutant under
EPA regulations. EPA’s National
Emission Standards for Hospital
Ethylene Oxide Sterilizers apply to this
substance and blends that contain it (see
subpart WWWWW of 40 CFR part 63).
EPA has previously found other blends
containing ethylene oxide to be
acceptable as sterilants. Further, blends
that do not contain ethylene oxide are
often still reactive.
Among the newly listed substitutes
for HCFC–22 blends, pure ethylene
oxide and peroxyacetic acid, a
component in a peroxyacetic acid/
hydrogen peroxide gas plasma system,
are flammable. Hydrogen peroxide is
not flammable per se, but is highly
reactive and must be handled cautiously
at the concentrations required for use in
sterilization equipment. These sterilants
should be used in equipment designed
to reduce the risks of flammable or
highly reactive chemicals. EPA believes
that the flammability and reactivity
risks can be addressed by existing
standards from OSHA, NIOSH, and
EPA, and/or by guidelines from the
manufacturer, and other safety
precautions common during
sterilization.
The toxicity risks of the newly listed
substitutes for HCFC–22 blends are
comparable to the risks of the IoGas
blends that EPA previously found
acceptable as substitutes for blends of
ethylene oxide and HCFCs. Ethylene
oxide has an OSHA PEL of 1 ppm on an
8-hour time-weighted average and a
NIOSH IDLH of 800 ppm (30-minute).
This compound may be carcinogenic.
Hydrogen peroxide, used in gas plasma
systems, has an OSHA PEL of 1 ppm (8hr TWA) and a NIOSH IDLH value of 75
ppm (30 min). Peroxyacetic acid, used
together with hydrogen peroxide in gas
plasma systems, has an AEGL–1 of 0.17
ppm from 10 min to 8 hours to avoid
irritation and an AEGL–2 of 0.5 ppm
from 10 min to 8 hours to avoid
‘‘irreversible or other serious, longlasting adverse health effects * * *.’’
(Acute Exposure Guideline Levels for
Selected Airborne Chemicals,
Committee on Acute Exposure
Guideline Levels, National Research
Council of the National Academies,
2009). EPA anticipates that users will be
able to meet the workplace exposure
limits (PELs, IDLHs, and AEGLs) and
will address potential health risks by
following requirements and
recommendations in the MSDSs and
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other safety precautions common when
working with sterilants. For the above
reasons, we find the newly listed
substitutes (in VII.A.2, above)
acceptable because they do not pose a
greater overall risk to human health and
the environment than the other
substitutes available in the end use.
You can find a complete chronology
of SNAP decisions and the appropriate
Federal Register citations from the
SNAP section of EPA’s Ozone Depletion
Web site at https://www.epa.gov/ozone/
snap/chron.html. This information is
also available from the Air Docket (see
ADDRESSES section above for contact
information).
List of Subjects in 40 CFR Part 82
Environmental protection,
Administrative practice and procedure,
Air pollution control, Reporting and
recordkeeping requirements.
Dated: June 10, 2010.
Brian J. McLean,
Director, Office of Atmospheric Programs,
Office of Air and Radiation.
[FR Doc. 2010–14510 Filed 6–15–10; 8:45 am]
BILLING CODE 6560–50–P
ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 174
[EPA–HQ–OPP–2009–0609; FRL–8829–9]
Bacillus thuringiensis eCry3.1Ab Protein
in Corn; Temporary Exemption from
the Requirement of a Tolerance
AGENCY: Environmental Protection
Agency (EPA).
ACTION: Final rule.
SUMMARY: This regulation establishes a
temporary exemption from the
requirement of a tolerance for residues
of Bacillus thuringiensis eCry3.1Ab
protein in corn in or on the food and
feed commodities of corn; corn, field;
corn, sweet; and corn, pop, when used
as a plant-incorporated protectant in
accordance with the terms of
Experimental Use Permit 67979-EUP-8.
Syngenta Seeds, Incorporated submitted
a petition to EPA under the Federal
Food, Drug, and Cosmetic Act (FFDCA),
requesting a temporary exemption from
the requirement of a tolerance. This
regulation eliminates the need to
establish a maximum permissible level
for residues of Bacillus thuringiensis
eCry3.1Ab protein in corn under the
FFDCA. The temporary tolerance
exemption expires on June 1, 2012.
DATES: This regulation is effective June
16, 2010. Objections and requests for
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hearings must be received on or before
August 16, 2010, and must be filed in
accordance with the instructions
provided in 40 CFR part 178 (see also
Unit I.C. of the SUPPLEMENTARY
INFORMATION).
whether this action might apply to
certain entities. If you have any
questions regarding the applicability of
this action to a particular entity, consult
the person listed under FOR FURTHER
INFORMATION CONTACT.
EPA has established a
docket for this action under docket
identification (ID) number EPA–HQ–
OPP–2009–0609. All documents in the
docket are listed in the docket index
available at https://www.regulations.gov.
Although listed in the index, some
information is not publicly available,
e.g., Confidential Business Information
(CBI) or other information whose
disclosure is restricted by statute.
Certain other material, such as
copyrighted material, is not placed on
the Internet and will be publicly
available only in hard copy form.
Publicly available docket materials are
available in the electronic docket at
https://www.regulations.gov, or, if only
available in hard copy, at the Office of
Pesticide Programs (OPP) Regulatory
Public Docket in Rm. S–4400, One
Potomac Yard (South Bldg.), 2777 S.
Crystal Dr., Arlington, VA. The Docket
Facility is open from 8:30 a.m. to 4 p.m.,
Monday through Friday, excluding legal
holidays. The Docket Facility telephone
number is (703) 305–5805.
FOR FURTHER INFORMATION CONTACT:
Mike Mendelsohn, Biopesticides and
Pollution Prevention Division (7511P),
Environmental Protection Agency, 1200
Pennsylvania Ave., NW., Washington,
DC 20460–0001; telephone number:
(703) 308–8715; e-mail address:
mendelsohn.mike@epa.gov.
B. How Can I Get Electronic Access to
Other Related Information?
You may access a frequently updated
electronic version of 40 CFR part 174
through the Government Printing
Office’s e-CFR site at https://
www.gpoaccess.gov/ecfr.
ADDRESSES:
SUPPLEMENTARY INFORMATION:
I. General Information
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A. Does this Action Apply to Me?
You may be potentially affected by
this action if you are an agricultural
producer, food manufacturer, or
pesticide manufacturer. Potentially
affected entities may include, but are
not limited to:
• Crop production (NAICS code 111).
• Animal production (NAICS code
112).
• Food manufacturing (NAICS code
311).
• Pesticide manufacturing (NAICS
code 32532).
This listing is not intended to be
exhaustive, but rather provides a guide
for readers regarding entities likely to be
affected by this action. Other types of
entities not listed in this unit could also
be affected. The North American
Industrial Classification System
(NAICS) codes have been provided to
assist you and others in determining
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C. How Can I File an Objection or
Hearing Request?
Under FFDCA section 408(g), 21
U.S.C. 346a(g), any person may file an
objection to any aspect of this regulation
and may also request a hearing on those
objections. You must file your objection
or request a hearing on this regulation
in accordance with the instructions
provided in 40 CFR part 178. To ensure
proper receipt by EPA, you must
identify docket ID number EPA–HQ–
OPP–2009–0609 in the subject line on
the first page of your submission. All
objections and requests for a hearing
must be in writing, and must be
received by the Hearing Clerk on or
before August 16, 2010. Addresses for
mail and hand delivery of objections
and hearing requests are provided in 40
CFR 178.25(b).
In addition to filing an objection or
hearing request with the Hearing Clerk
as described in 40 CFR part 178, please
submit a copy of the filing that does not
contain any CBI for inclusion in the
public docket. Information not marked
confidential pursuant to 40 CFR part 2
may be disclosed publicly by EPA
without prior notice. Submit a copy of
your non-CBI objection or hearing
request, identified by docket ID number
EPA–HQ–OPP–2009–0609, by one of
the following methods:
• Federal eRulemaking Portal: https://
www.regulations.gov. Follow the on-line
instructions for submitting comments.
• Mail: OPP Regulatory Public Docket
(7502P), Environmental Protection
Agency, 1200 Pennsylvania Ave., NW.,
Washington, DC 20460–0001.
• Delivery: OPP Regulatory Public
Docket (7502P), Environmental
Protection Agency, Rm. S–4400, One
Potomac Yard (South Bldg.), 2777 S.
Crystal Dr., Arlington, VA. Deliveries
are only accepted during the Docket
Facility’s normal hours of operation
(8:30 a.m. to 4 p.m., Monday through
Friday, excluding legal holidays).
Special arrangements should be made
for deliveries of boxed information. The
Docket Facility telephone number is
(703) 305–5805.
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II. Background and Statutory Findings
In the Federal Register of September
30, 2009 (74 FR 50196) (FRL–8433–3),
EPA issued a notice pursuant to section
408(d)(3) of FFDCA, 21 U.S.C.
346a(d)(3), announcing the filing of a
pesticide tolerance petition (PP 9F7561)
by Syngenta Seeds, Incorporated, P.O.
Box 12257, Research Triangle Park, NC
27709. The petition requested that 40
CFR part 174 be amended by
establishing an exemption from the
requirement of a tolerance for residues
of Bacillus thuringiensis eCry3.1Ab
protein in corn. This notice referenced
a summary of the petition prepared by
the petitioner Syngenta Seeds,
Incorporated, which is available in the
docket, https://www.regulations.gov.
Comments were received on the notice
of filing. EPA’s response to these
comments is discussed in Unit VII.C.
Section 408(c)(2)(A)(i) of FFDCA
allows EPA to establish an exemption
from the requirement for a tolerance (the
legal limit for a pesticide chemical
residue in or on a food) only if EPA
determines that the exemption is ‘‘safe.’’
Section 408(c)(2)(A)(ii) of FFDCA
defines ‘‘safe’’ to mean that ‘‘there is a
reasonable certainty that no harm will
result from aggregate exposure to the
pesticide chemical residue, including
all anticipated dietary exposures and all
other exposures for which there is
reliable information.’’ This includes
exposure through drinking water and in
residential settings, but does not include
occupational exposure. Pursuant to
section 408(c)(2)(B) of FFDCA, in
establishing or maintaining in effect an
exemption from the requirement of a
tolerance, EPA must take into account
the factors set forth in section
408(b)(2)(C) of FFDCA, which require
EPA to give special consideration to
exposure of infants and children to the
pesticide chemical residue in
establishing a tolerance and to ‘‘ensure
that there is a reasonable certainty that
no harm will result to infants and
children from aggregate exposure to the
pesticide chemical residue....’’
Additionally, section 408(b)(2)(D) of
FFDCA requires that the Agency
consider ‘‘available information
concerning the cumulative effects of a
particular pesticide’s residues and other
substances that have a common
mechanism of toxicity.’’
EPA performs a number of analyses to
determine the risks from aggregate
exposure to pesticide residues. First,
EPA determines the toxicity of
pesticides. Second, EPA examines
exposure to the pesticide through food,
drinking water, and through other
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exposures that occur as a result of
pesticide use in residential settings.
III. Toxicological Profile
Consistent with section 408(b)(2)(D)
of FFDCA, EPA has reviewed the
available scientific data and other
relevant information in support of this
action and considered its validity,
completeness, and reliability and the
relationship of this information to
human risk. EPA has also considered
available information concerning the
variability of the sensitivities of major
identifiable subgroups of consumers,
including infants and children.
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A. Product Characterization Overview
Based on amino acid sequence
homology and crystal structures, known
Cry proteins have a similar threedimensional structure comprised of
three domains, Domain I, II, and III
(Refs. 3, 5, 6 and 7). The toxin portions
of Cry proteins are characterized by
having five conserved blocks (CB) across
their amino acid sequence. These are
numbered CB1 to CB5 from the Nterminus to the C-terminus (Ref. 4). The
sequences preceding and following
these conserved blocks are highly
variable and are designated as variable
regions V1 to V6.
Syngenta Seeds, Incorporated
developed Event 5307 maize (Zea mays)
through Agrobacterium-mediated
transformation (via plasmid vector PVZMIR245) to express eCry3.1Ab protein
for use as a plant-incorporated
protectant (PIP). This proposed PIP is a
chimeric Bacillus thuringiensis protein,
composed of portions of Cry1Ab and
modified Cry3A proteins. The
eCry3.1Ab protein was genetically
engineered via exchanging the variable
regions (V1 to V6) between the mCry3A
and the Cry1Ab proteins for enhanced
toxicity against western corn rootworm
(WCR, Diabrotica virgifera). The
eCry3.1Ab protein consists of a fusion
between the N-terminus (Domain I,
Domain II, and a portion of Domain III)
of mCry3 A and the C-terminus (a
portion of Domain III and variable
region 6) of Cry1Ab. The eCry3.1Ab
protein is 654 amino acid residues in
size and is approximately 73.7
kilodaltons.
B. Mammalian Toxicity and
Allergenicity Assessment
Syngenta has submitted acute oral
toxicity data demonstrating the lack of
mammalian toxicity at high levels of
exposure to the pure eCry3.1Ab protein.
These data demonstrate the safety of the
product at a level well above maximum
possible exposure levels that are
reasonably anticipated in the crop.
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Basing this conclusion on acute oral
toxicity data without requiring further
toxicity testing and residue data is
similar to the Agency position regarding
toxicity testing and the requirement of
residue data for the microbial Bacillus
thuringiensis products from which this
PIP was derived (see 40 CFR
158.2130(d)(1)(i) and 158.2140(d)(7)).
For microbial products, further toxicity
testing and residue data are triggered by
significant adverse acute effects in
studies, such as the mouse oral toxicity
study, to verify and quantify the
observed adverse effects and clarify the
source of these effects (Tiers II & III).
An acute oral toxicity study in mice
(Master Record Identification Number
MRID No. 477539-01) indicated that
eCry3.1Ab is nontoxic. Two groups of
10 male and 10 female mice were orally
dosed (via gavage) with 2,000
milligrams/kilograms bodyweight (mg/
kg bwt) (eCry3.1Ab protein mg/kg bwt)
of the eCry3.1Ab-0208 test substance,
the microbial-produced eCry3.1Ab
protein. All treated animals gained
weight and had no test material-related
clinical signs and no test materialrelated findings at necropsy. Since there
were no significant differences between
the test and control groups related to the
oral administration of eCry3.1Ab-0208
test material, the eCry3.1Ab protein
does not appear to cause any significant
adverse effects at an exposure level of
up to 2,000 mg/kg bwt and supports the
finding that the eCry3.1Ab protein
would be nontoxic to mammals.
When proteins are toxic, they are
known to act via acute mechanisms and
at very low dose levels (Ref. 8).
Therefore, since no acute effects were
shown to be caused by eCry3.1Ab, even
at relatively high dose levels, the
eCry3.1Ab protein is not considered
toxic. Further, amino acid sequence
comparisons showed no similarities
between the eCry3.1Ab protein and
known toxic proteins in protein
databases that would raise a safety
concern.
Since eCry3.1Ab is a protein,
allergenic sensitivities were considered.
Currently, no definitive tests exist for
determining the allergenic potential of
novel proteins. Therefore, EPA uses a
‘‘weight-of-the-evidence’’ approach
where the following factors are
considered: Source of the trait; amino
acid sequence similarity with known
allergens; prevalence in food; and
biochemical properties of the protein,
including in vitro digestibility in
simulated gastric fluid (SGF) and
glycosylation (as recommended by CAC
2003, see Ref. 2). Current scientific
knowledge suggests that common food
allergens tend to be resistant to
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degradation by acid and proteases; may
be glycosylated; and present at high
concentrations in the food.
1. Source of the trait. Bacillus
thuringiensis is not considered to be a
source of allergenic proteins.
2. Amino acid sequence. A
comparison of the amino acid sequence
of eCry3.1Ab with known allergens
showed no significant overall sequence
similarity or identity at the level of eight
contiguous amino acid residues. This is
the appropriate level of sensitivity to
detect possible IgE epitopes without
high false positive rates.
3. Prevalence in food. Preliminary
expression level analysis shows that the
eCry.1Ab protein is present at relatively
low levels. Dietary exposure is expected
to be correspondingly low. Expression
in Event 5307 leaf is 35 parts per
million ppm; root is 6 ppm; and pollen
is 0.15 ppm. Thus, the expression has
been shown to be in the parts per
million range.
4. Digestibility. The eCry3.1Ab protein
was rapidly digested in simulated
mammalian gastric fluid containing
pepsin at a pH of 1.2 at 37°C.
Theestimated degradation rate (DT50) is
less than 1 minute for eCry3.1Ab
protein.
5. Glycosylation. The eCry3.1Ab
protein expressed in corn was shown
not to be glycosylated.
6. Conclusion. Considering all of the
available information, EPA has
concluded that the potential for
eCry3.1Ab to be a food allergen is
minimal.
IV. Aggregate Exposures
In examining aggregate exposure,
section 408 of FFDCA directs EPA to
consider available information
concerning exposures from the pesticide
residue in food and all other nonoccupational exposures, including
drinking water from ground water or
surface water and exposure through
pesticide use in gardens, lawns, or
buildings (residential and other indoor
uses).
The Agency has considered available
information on the aggregate exposure
levels of consumers (and major
identifiable subgroups of consumers) to
the pesticide chemical residue and to
other related substances. First, with
respect to other related substances, the
eCry3.1Ab protein is a chimeric Bacillus
thuringiensis protein, composed of
portions of Cry1Ab and mCry3A
proteins both of which are registered
PIPs that were previously assessed as
having a lack of mammalian toxicity at
high levels of exposure. Exemptions
from the requirement of a tolerance have
been established for Cry1Ab in food and
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mCry3A in maize, (see 40 CFR 174.511,
effective Apr. 25, 2007 and 40 CFR
174.505, effective Apr. 25, 2007,
respectively). Second, and specific to
the eCry3.1Ab protein, these
considerations include dietary exposure
under the tolerance exemption and all
other tolerances or exemptions in effect
for the PIP chemical residue and
exposure from non-occupational
sources. Exposure via the skin or
inhalation is not likely since the PIP is
contained within plant cells, which
essentially eliminates these exposure
routes or reduces these exposure routes
to negligible. The amino acid homology
assessment included similarity to
known aeroallergens. It has been
demonstrated that there is no evidence
of occupationally-related respiratory
symptoms, based on a health survey on
migrant workers after exposure to Bt
pesticides (Ref. 1). Exposure via
residential or lawn use to infants and
children is also not expected because
the use sites for the eCry3.1Ab protein
are all agricultural for control of insects.
Oral exposure, at very low levels, may
occur from ingestion of processed corn
products and, potentially, drinking
water.
However, oral toxicity testing done at
a dose of 2 gm/kg showed no adverse
effects. Furthermore, the expected
dietary exposure from corn is several
orders of magnitude lower than the
amounts of eCry3.1Ab protein shown to
have no toxicity. Therefore, even if
negligible aggregate exposure should
occur, the Agency concludes that such
exposure would present no harm due to
the lack of mammalian toxicity and the
rapid digestibility demonstrated for the
eCry3.1Ab protein.
V. Cumulative Effects from Substances
with a Common Mechanism of Toxicity
Section 408(b)(2)(D)(v) of FFDCA
requires that, when considering whether
to establish, modify, or revoke a
tolerance, the Agency consider
‘‘available information’’ concerning the
cumulative effects of a particular
pesticide’s residues and ‘‘other
substances that have a common
mechanism of toxicity.’’
Since eCry3.1Ab is not considered
toxic, EPA has not found eCry3.1Ab
protein to share a common mechanism
of toxicity with any other substances,
and eCry3.1Ab protein does not appear
to produce a toxic metabolite produced
by other substances. For the purposes of
this tolerance action, therefore, EPA has
assumed that eCry3.1Ab protein does
not have a common mechanism of
toxicity with other substances.
Following from this, therefore, EPA
concludes that there are no cumulative
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effects associated with eCry3.1Ab that
need to be considered. For information
regarding EPA’s efforts to determine
which chemicals have a common
mechanism of toxicity and to evaluate
the cumulative effects of such
chemicals, see EPA’s website at https://
www.epa.gov/pesticides/cumulative.
VI. Determination of Safety for the U.S.
Population, Infants, and Children
The data submitted and cited
regarding potential health effects for the
eCry3.1Ab protein include the
characterization of the expressed
eCry3.1Ab protein in corn, as well as
the acute oral toxicity, heat stability,
and in vitro digestibility of the protein.
The results of these studies were used
to evaluate human risk, and the validity,
completeness, and reliability of the
available data from the studies were also
considered.
As discussed more fully in Unit III.
above, the acute oral toxicity data
submitted supports the prediction that
the eCry3.1Ab protein would be
nontoxic to humans. Moreover,
eCry3.1Ab showed no sequence
similarity to any known toxin. Because
of this lack of demonstrated mammalian
toxicity, no protein residue chemistry
data for eCry3.1Ab were required for a
human health effects assessment. Even
so, preliminary expression level
analysis showed eCry3.1Ab protein is
present at relatively low levels. Dietary
exposure is expected to be
correspondingly low.
In addition, since eCry3.1Ab is a
protein, its potential allergenicity was
also considered as part of the toxicity
assessment. Data considered as part of
the allergenicity assessment include that
the eCry3.1Ab protein came from
Bacillus thuringiensis, which is not a
known allergenic source, showed no
sequence similarity to known allergens,
was readily degraded by pepsin, and
was not glycosylated when expressed in
the plant. Therefore, there is a
reasonable certainty that eCry3.1Ab
protein will not be an allergen.
Considered together, the lack of
mammalian toxicity at high levels of
exposure to the eCry3.1Ab protein and
the minimal potential for that protein to
be a food allergen demonstrate the
safety of the product at levels well
above possible maximum exposure
levels anticipated in the crop.
Finally, and specifically in regards to
infants and children, FFDCA section
408(b)(2)(C) provides that EPA shall
assess the available information about
consumption patterns among infants
and children, special susceptibility of
infants and children to pesticide
chemical residues, and the cumulative
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34043
effects on infants and children of the
residues and other substances with a
common mechanism of toxicity. In
addition, FFDCA section 408(b)(2)(C)
provides that EPA shall apply an
additional tenfold margin of safety for
infants and children in the case of
threshold effects to account for prenatal
and postnatal toxicity and the
completeness of the data base unless
EPA determines that a different margin
of safety will be safe for infants and
children.
Based on its review and consideration
of all the available information, as
discussed in more detail above, the
Agency concludes that there is a
reasonable certainty that no harm will
result to the U.S. population, including
infants and children, from aggregate
exposure to residues of the eCry3.1Ab
protein and the genetic material
necessary for its production in corn.
This includes all anticipated dietary
exposures and all other exposures for
which there is reliable information. The
Agency has also concluded, again for
the reasons discussed in more detail
above, that there are no threshold effects
of concern and, as a result, that an
additional margin of safety for infants
and children is unnecessary in this
instance.
VII. Other Considerations
A. Analytical Enforcement Methodology
The Agency has determined that an
analytical method is not required for
enforcement purposes since the Agency
is establishing an exemption from the
requirement of a tolerance without any
numerical limitation. Nonetheless, a
method for extraction and two test strip
commercial kits to detect eCry3.1Ab
protein via enzyme-linked
immunosorbent assay analysis in corn
have been submitted and are under
review by the Agency.
B. International Residue Limits
In making its tolerance decisions, EPA
seeks to harmonize U.S. tolerances with
international standards whenever
possible, consistent with U.S. food
safety standards and agricultural
practices. In this context, EPA considers
the international maximum residue
limits (MRLs) established by the Codex
Alimentarius Commission (Codex), as
required by FFDCA section 408(b)(4).
The Codex Alimentarius is a joint U.N.
Food and Agriculture Organization/
World Health Organization food
standards program, and it is recognized
as an international food safety
standards-setting organization in trade
agreements to which the United States
is a party. EPA may establish a tolerance
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Federal Register / Vol. 75, No. 115 / Wednesday, June 16, 2010 / Rules and Regulations
that is different from a Codex MRL;
however, FFDCA section 408(b)(4)
requires that EPA explain the reasons
for departing from the Codex level. The
Codex has not established a MRL for
eCry3.1Ab protein in corn.
C. Response to Comments
One comment was received from an
anonymous individual who objected in
general terms to EPA’s registration of
any pesticides and its approval of any
tolerance or tolerance exemption,
claiming that no safety testing is
required or undertaken. While the
Agency understands that some
individuals are opposed to all pesticide
use, relavant data (discussed above) did
serve as the basis for EPA’s conclusion
in this instance that there is a
reasonable certainty of no harm from
residues of Bacillus thuringiensis
eCry3.1Ab protein in corn.
mstockstill on DSKH9S0YB1PROD with RULES
VIII. Conclusions
The Agency concludes that there is a
reasonable certainty that no harm will
result to the U.S. population, including
infants and children, from aggregate
exposure to residues of eCry3.1Ab
protein in corn and the genetic material
necessary for its production. Therefore,
a temporary exemption is established
for residues of Bacillus thuringiensis
eCry3.1Ab protein in or on corn.
IX. References
1. Bernstein IL, Bernstein JA, Miller
M, Tierzieva S, Bernstein DI., Lummus
Z, Selgrade MK, Doerfler DL, Seligy VL.
1999. Immune responses in farm
workers after exposure to Bacillus
thuringiensis pesticides. Environmental
Health Perspectives. 107(7):575–82.
2. CAC. 2003. Alinorm 03/34: Joint
FAO/WHO Food Standard Programme.
Codex Alimentarius Commission,
Twenty-Fifth Session, 30 July 2003.
Rome, Italy. Appendix III: Guideline for
Conduct of Food Safety Assessments of
Foods Derived from Recombinant-DNA
Plants; Appendix IV: Annex on
Assessment of Possible Allergenicity.
Codex Alimentarius Commision, 47–60.
3. Ge A, Rivers D, Milne R, Dean DH.
1991. Functional Domains of Bacillus
thuringiensis Insecticidal Crystal
Proteins. Refinement of Heliothis
virescens and Trichoplusiani Specificity
Domains on Cry1A(c). Journal of
Biological Chemistry. 266: 17954–
17958.
4. Hofte H, Whitley HR. 1989.
Insecticidal Crystal Proteins of Bacillus
VerDate Mar<15>2010
16:21 Jun 15, 2010
Jkt 220001
thuringiensis.. Microbiology Review. 53:
242–255.
5. Honee G, Convents D, Van Rie J,
Jansens S, Peferoen M, Visser B. 1991.
The C-Terminal Domain of the Toxic
Fragment of a Bacillus thuringiensis
Crystal Protein Determines Receptor
Binding. Molecular Microbiology. 5:
2799–2806.
6. Li J, Carroll J, Ellar DJ. 1991. Crystal
Structure of Insecticidal d-Endotoxin
from Bacillus thuringiensis at 2.5 A
resolution. Nature. 353: 815–821.
7. Nakamura K, Oshie K, Shimizu M,
Takada Y, Oeda K, Ohkawa H. 1990.
Construction of Chimeric Insecticidal
Proteins Between the 130-kDa and 135kDa Proteins of Bacillus thuringiensis
subsp. aizawai for Analysis of StructureFunction Relationship. Agricultural
Biological Chemistry. 54: 715–724.
8. Sjoblad R D, McClintock JT, Engler
R. 1992. Toxicological Considerations
for Protein Components of Biological
Pesticide Products. Regulatory
Toxicology and Pharmacology. 15(1): 3–
9.
X. Statutory and Executive Order
Reviews
This final rule establishes a tolerance
exemption under section 408(d) of
FFDCA in response to a petition
submitted to the Agency. The Office of
Management and Budget (OMB) has
exempted these types of actions from
review under Executive Order 12866,
entitled Regulatory Planning and
Review (58 FR 51735, October 4, 1993).
Because this final rule has been
exempted from review under Executive
Order 12866, this final rule is not
subject to Executive Order 13211,
entitled Actions Concerning Regulations
That Significantly Affect Energy Supply,
Distribution, or Use (66 FR 28355, May
22, 2001), or Executive Order 13045,
entitled Protection of Children from
Environmental Health Risks and Safety
Risks (62 FR 19885, April 23, 1997).
This final rule does not contain any
information collections subject to OMB
approval under the Paperwork
Reduction Act (PRA), 44 U.S.C. 3501 et
seq., nor does it require any special
considerations under Executive Order
12898, entitled Federal Actions to
Address Environmental Justice in
Minority Populations and Low-Income
Populations (59 FR 7629, February 16,
1994).
Since tolerances and exemptions that
are established on the basis of a petition
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Fmt 4700
Sfmt 4700
under section 408(d) of FFDCA, such as
the tolerance exemption in this final
rule, do not require the issuance of a
proposed rule, the requirements of the
Regulatory Flexibility Act (RFA) (5
U.S.C. 601 et seq.) do not apply.
This final rule directly regulates
growers, food processors, food handlers,
and food retailers, not States or tribes.
As a result, this action does not alter the
relationships or distribution of power
and responsibilities established by
Congress in the preemption provisions
of section 408(n)(4) of FFDCA. As such,
the Agency has determined that this
action will not have a substantial direct
effect on States or tribal governments,
on the relationship between the national
government and the States or tribal
governments, or on the distribution of
power and responsibilities among the
various levels of government or between
the Federal Government and Indian
tribes. Thus, the Agency has determined
that Executive Order 13132, entitled
Federalism (64 FR 43255, August 10,
1999), and Executive Order 13175,
entitled Consultation and Coordination
with Indian Tribal Governments (65 FR
67249, November 9, 2000), do not apply
to this final rule. In addition, this final
rule does not impose any enforceable
duty or contain any unfunded mandate
as described under Title II of the
Unfunded Mandates Reform Act of 1995
(UMRA) (Public Law 104–4).
This action does not involve any
technical standards that would require
Agency consideration of voluntary
consensus standards pursuant to section
12(d) of the National Technology
Transfer and Advancement Act of 1995
(NTTAA), Public Law 104–113, section
12(d) (15 U.S.C. 272 note).
XI. Congressional Review Act
The Congressional Review Act, 5
U.S.C. 801 et seq., generally provides
that before a rule may take effect, the
agency promulgating the rule must
submit a rule report to each House of
the Congress and to the Comptroller
General of the United States. EPA will
submit a report containing this rule and
other required information to the U.S.
Senate, the U.S. House of
Representatives, and the Comptroller
General of the United States prior to
publication of this final rule in the
Federal Register. This final rule is not
a ‘‘major rule’’ as defined by 5 U.S.C.
804(2).
E:\FR\FM\16JNR1.SGM
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Federal Register / Vol. 75, No. 115 / Wednesday, June 16, 2010 / Rules and Regulations
List of Subjects in 40 CFR Part 174
Environmental protection,
Administrative practice and procedure,
Agricultural commodities, Pesticides
and pests, Reporting and recordkeeping
requirements.
Dated: June 1, 2010.
Steven Bradbury,
Acting Director, Office of Pesticide Programs.
Therefore, 40 CFR chapter I is
amended as follows:
■
PART 174—[AMENDED]
1. The authority citation for part 174
continues to read as follows:
■
Authority: 21 U.S.C. 321(q), 346a and 371.
2. Add § 174.532 to subpart W to read
as follows:
■
§ 174.532 Bacillus thuringiensis eCry3.1Ab
protein in corn; temporary exemption from
the requirement of a tolerance.
Residues of Bacillus thuringiensis
eCry3.1Ab protein in corn, in or on the
food and feed commodities of corn;
corn, field; corn, sweet; and corn, pop
are exempt temporarily from the
requirement of a tolerance when
Bacillus thuringiensis eCry3.1Ab
protein in corn is used as a plantincorporated protectant in accordance
with the terms of Experimental Use
Permit 67979-EUP-8. This temporary
exemption from the requirement of a
tolerance expires and is revoked on June
1, 2012.
[FR Doc. 2010–14330 Filed 6–15–10; 8:45 am]
BILLING CODE 6560–50–S
ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 180
[EPA–HQ–OPP–2008–0739; FRL–8825–2]
Sodium 1,4-Dialkyl Sulfosuccinates;
Exemption from the Requirement of a
Tolerance
mstockstill on DSKH9S0YB1PROD with RULES
AGENCY: Environmental Protection
Agency (EPA).
ACTION: Final rule.
SUMMARY: This regulation establishes an
exemption from the requirement of a
tolerance for residues of sodium 1,4dialkyl sulfosuccinates including
sodium 1,4-dihexyl sulfosuccinate (CAS
Reg. No. 3006–15–3); sodium 1,4diisobutyl sulfosuccinate (CAS Reg. No.
127–39–9); and sodium 1,4-dipentyl
sulfosuccinate (CAS Reg. No. 922–80–5)
when used as an inert ingredient in
pesticide formulations for pre-harvest
and post-harvest uses, as well as, for
application to animals under 40 CFR
VerDate Mar<15>2010
16:21 Jun 15, 2010
Jkt 220001
180.910 and 40 CFR 180.930,
respectively. The Joint Inerts Task Force
(JITF), Cluster Support Team 13
submitted a petition to EPA under the
Federal Food, Drug, and Cosmetic Act
(FFDCA), requesting establishment of an
exemption from the requirement of a
tolerance. This regulation eliminates the
need to establish a maximum
permissible level for residues of the
sodium 1,4-dialkyl sulfosuccinates.
DATES: This regulation is effective June
16, 2010. Objections and requests for
hearings must be received on or before
August 16, 2010, and must be filed in
accordance with the instructions
provided in 40 CFR part 178 (see also
Unit I.C. of the SUPPLEMENTARY
INFORMATION).
ADDRESSES: EPA has established a
docket for this action under docket
identification (ID) number EPA–HQ–
OPP–2008–0739. All documents in the
docket are listed in the docket index
available at https://www.regulations.gov.
Although listed in the index, some
information is not publicly available,
e.g., Confidential Business Information
(CBI) or other information whose
disclosure is restricted by statute.
Certain other material, such as
copyrighted material, is not placed on
the Internet and will be publicly
available only in hard copy form.
Publicly available docket materials are
available in the electronic docket at
https://www.regulations.gov, or, if only
available in hard copy, at the OPP
Regulatory Public Docket in Rm. S–
4400, One Potomac Yard (South Bldg.),
2777 S. Crystal Dr., Arlington, VA. The
Docket Facility is open from 8:30 a.m.
to 4 p.m., Monday through Friday,
excluding legal holidays. The Docket
Facility telephone number is (703) 305–
5805.
FOR FURTHER INFORMATION CONTACT:
Karen Samek, Registration Division
(7505P), Office of Pesticide Programs,
Environmental Protection Agency, 1200
Pennsylvania Ave., NW., Washington,
DC 20460–0001; telephone number:
(703) 347–8825; e-mail address:
samek.karen@epa.gov.
SUPPLEMENTARY INFORMATION:
I. General Information
A. Does this Action Apply to Me?
You may be potentially affected by
this action if you are an agricultural
producer, food manufacturer, or
pesticide manufacturer. Potentially
affected entities may include, but are
not limited to:
• Crop production (NAICS code 111).
• Animal production (NAICS code
112).
PO 00000
Frm 00057
Fmt 4700
Sfmt 4700
34045
• Food manufacturing (NAICS code
311).
• Pesticide manufacturing (NAICS
code 32532).
This listing is not intended to be
exhaustive, but rather provides a guide
for readers regarding entities likely to be
affected by this action. Other types of
entities not listed in this unit could also
be affected. The North American
Industrial Classification System
(NAICS) codes have been provided to
assist you and others in determining
whether this action might apply to
certain entities. If you have any
questions regarding the applicability of
this action to a particular entity, consult
the person listed under FOR FURTHER
INFORMATION CONTACT.
B. How Can I Get Electronic Access to
Other Related Information?
You may access a frequently updated
electronic version of 40 CFR part 180
through the Government Printing
Office’s e-CFR cite at https://
www.gpoaccess.gov/ecfr. To access the
OPPTS harmonized test guidelines
referenced in this document
electronically, please go to https://
www.epa.gov/oppts and select ‘‘Test
Methods and Guidelines.’’
C. Can I File an Objection or Hearing
Request?
Under section 408(g) of FFDCA, 21
U.S.C. 346a, any person may file an
objection to any aspect of this regulation
and may also request a hearing on those
objections. The EPA procedural
regulations which govern the
submission of objections and requests
for hearings appear in 40 CFR part 178.
You must file your objection or request
a hearing on this regulation in
accordance with the instructions
provided in 40 CFR part 178. To ensure
proper receipt by EPA, you must
identify docket ID number EPA–HQ–
OPP–2008–0739 in the subject line on
the first page of your submission. All
objections and requests for a hearing
must be in writing, and must be
received by the Hearing Clerk on or
before August 16, 2010. Addresses for
mail and hand delivery of objections
and hearing requests are provided in 40
CFR 178.25(b).
In addition to filing an objection or
hearing request with the Hearing Clerk
as described in 40 CFR part 178, please
submit a copy of the filing that does not
contain any CBI for inclusion in the
public docket that is described in
ADDRESSES. Information not marked
confidential pursuant to 40 CFR part 2
may be disclosed publicly by EPA
without prior notice. Submit your
copies, identified by docket ID number
E:\FR\FM\16JNR1.SGM
16JNR1
Agencies
[Federal Register Volume 75, Number 115 (Wednesday, June 16, 2010)]
[Rules and Regulations]
[Pages 34040-34045]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-14330]
-----------------------------------------------------------------------
ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 174
[EPA-HQ-OPP-2009-0609; FRL-8829-9]
Bacillus thuringiensis eCry3.1Ab Protein in Corn; Temporary
Exemption from the Requirement of a Tolerance
AGENCY: Environmental Protection Agency (EPA).
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: This regulation establishes a temporary exemption from the
requirement of a tolerance for residues of Bacillus thuringiensis
eCry3.1Ab protein in corn in or on the food and feed commodities of
corn; corn, field; corn, sweet; and corn, pop, when used as a plant-
incorporated protectant in accordance with the terms of Experimental
Use Permit 67979-EUP-8. Syngenta Seeds, Incorporated submitted a
petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA),
requesting a temporary exemption from the requirement of a tolerance.
This regulation eliminates the need to establish a maximum permissible
level for residues of Bacillus thuringiensis eCry3.1Ab protein in corn
under the FFDCA. The temporary tolerance exemption expires on June 1,
2012.
DATES: This regulation is effective June 16, 2010. Objections and
requests for
[[Page 34041]]
hearings must be received on or before August 16, 2010, and must be
filed in accordance with the instructions provided in 40 CFR part 178
(see also Unit I.C. of the SUPPLEMENTARY INFORMATION).
ADDRESSES: EPA has established a docket for this action under docket
identification (ID) number EPA-HQ-OPP-2009-0609. All documents in the
docket are listed in the docket index available at https://www.regulations.gov. Although listed in the index, some information is
not publicly available, e.g., Confidential Business Information (CBI)
or other information whose disclosure is restricted by statute. Certain
other material, such as copyrighted material, is not placed on the
Internet and will be publicly available only in hard copy form.
Publicly available docket materials are available in the electronic
docket at https://www.regulations.gov, or, if only available in hard
copy, at the Office of Pesticide Programs (OPP) Regulatory Public
Docket in Rm. S-4400, One Potomac Yard (South Bldg.), 2777 S. Crystal
Dr., Arlington, VA. The Docket Facility is open from 8:30 a.m. to 4
p.m., Monday through Friday, excluding legal holidays. The Docket
Facility telephone number is (703) 305-5805.
FOR FURTHER INFORMATION CONTACT: Mike Mendelsohn, Biopesticides and
Pollution Prevention Division (7511P), Environmental Protection Agency,
1200 Pennsylvania Ave., NW., Washington, DC 20460-0001; telephone
number: (703) 308-8715; e-mail address: mendelsohn.mike@epa.gov.
SUPPLEMENTARY INFORMATION:
I. General Information
A. Does this Action Apply to Me?
You may be potentially affected by this action if you are an
agricultural producer, food manufacturer, or pesticide manufacturer.
Potentially affected entities may include, but are not limited to:
Crop production (NAICS code 111).
Animal production (NAICS code 112).
Food manufacturing (NAICS code 311).
Pesticide manufacturing (NAICS code 32532).
This listing is not intended to be exhaustive, but rather provides
a guide for readers regarding entities likely to be affected by this
action. Other types of entities not listed in this unit could also be
affected. The North American Industrial Classification System (NAICS)
codes have been provided to assist you and others in determining
whether this action might apply to certain entities. If you have any
questions regarding the applicability of this action to a particular
entity, consult the person listed under FOR FURTHER INFORMATION
CONTACT.
B. How Can I Get Electronic Access to Other Related Information?
You may access a frequently updated electronic version of 40 CFR
part 174 through the Government Printing Office's e-CFR site at https://www.gpoaccess.gov/ecfr.
C. How Can I File an Objection or Hearing Request?
Under FFDCA section 408(g), 21 U.S.C. 346a(g), any person may file
an objection to any aspect of this regulation and may also request a
hearing on those objections. You must file your objection or request a
hearing on this regulation in accordance with the instructions provided
in 40 CFR part 178. To ensure proper receipt by EPA, you must identify
docket ID number EPA-HQ-OPP-2009-0609 in the subject line on the first
page of your submission. All objections and requests for a hearing must
be in writing, and must be received by the Hearing Clerk on or before
August 16, 2010. Addresses for mail and hand delivery of objections and
hearing requests are provided in 40 CFR 178.25(b).
In addition to filing an objection or hearing request with the
Hearing Clerk as described in 40 CFR part 178, please submit a copy of
the filing that does not contain any CBI for inclusion in the public
docket. Information not marked confidential pursuant to 40 CFR part 2
may be disclosed publicly by EPA without prior notice. Submit a copy of
your non-CBI objection or hearing request, identified by docket ID
number EPA-HQ-OPP-2009-0609, by one of the following methods:
Federal eRulemaking Portal: https://www.regulations.gov.
Follow the on-line instructions for submitting comments.
Mail: OPP Regulatory Public Docket (7502P), Environmental
Protection Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460-
0001.
Delivery: OPP Regulatory Public Docket (7502P),
Environmental Protection Agency, Rm. S-4400, One Potomac Yard (South
Bldg.), 2777 S. Crystal Dr., Arlington, VA. Deliveries are only
accepted during the Docket Facility's normal hours of operation (8:30
a.m. to 4 p.m., Monday through Friday, excluding legal holidays).
Special arrangements should be made for deliveries of boxed
information. The Docket Facility telephone number is (703) 305-5805.
II. Background and Statutory Findings
In the Federal Register of September 30, 2009 (74 FR 50196) (FRL-
8433-3), EPA issued a notice pursuant to section 408(d)(3) of FFDCA, 21
U.S.C. 346a(d)(3), announcing the filing of a pesticide tolerance
petition (PP 9F7561) by Syngenta Seeds, Incorporated, P.O. Box 12257,
Research Triangle Park, NC 27709. The petition requested that 40 CFR
part 174 be amended by establishing an exemption from the requirement
of a tolerance for residues of Bacillus thuringiensis eCry3.1Ab protein
in corn. This notice referenced a summary of the petition prepared by
the petitioner Syngenta Seeds, Incorporated, which is available in the
docket, https://www.regulations.gov. Comments were received on the
notice of filing. EPA's response to these comments is discussed in Unit
VII.C.
Section 408(c)(2)(A)(i) of FFDCA allows EPA to establish an
exemption from the requirement for a tolerance (the legal limit for a
pesticide chemical residue in or on a food) only if EPA determines that
the exemption is ``safe.'' Section 408(c)(2)(A)(ii) of FFDCA defines
``safe'' to mean that ``there is a reasonable certainty that no harm
will result from aggregate exposure to the pesticide chemical residue,
including all anticipated dietary exposures and all other exposures for
which there is reliable information.'' This includes exposure through
drinking water and in residential settings, but does not include
occupational exposure. Pursuant to section 408(c)(2)(B) of FFDCA, in
establishing or maintaining in effect an exemption from the requirement
of a tolerance, EPA must take into account the factors set forth in
section 408(b)(2)(C) of FFDCA, which require EPA to give special
consideration to exposure of infants and children to the pesticide
chemical residue in establishing a tolerance and to ``ensure that there
is a reasonable certainty that no harm will result to infants and
children from aggregate exposure to the pesticide chemical
residue....'' Additionally, section 408(b)(2)(D) of FFDCA requires that
the Agency consider ``available information concerning the cumulative
effects of a particular pesticide's residues and other substances that
have a common mechanism of toxicity.''
EPA performs a number of analyses to determine the risks from
aggregate exposure to pesticide residues. First, EPA determines the
toxicity of pesticides. Second, EPA examines exposure to the pesticide
through food, drinking water, and through other
[[Page 34042]]
exposures that occur as a result of pesticide use in residential
settings.
III. Toxicological Profile
Consistent with section 408(b)(2)(D) of FFDCA, EPA has reviewed the
available scientific data and other relevant information in support of
this action and considered its validity, completeness, and reliability
and the relationship of this information to human risk. EPA has also
considered available information concerning the variability of the
sensitivities of major identifiable subgroups of consumers, including
infants and children.
A. Product Characterization Overview
Based on amino acid sequence homology and crystal structures, known
Cry proteins have a similar three-dimensional structure comprised of
three domains, Domain I, II, and III (Refs. 3, 5, 6 and 7). The toxin
portions of Cry proteins are characterized by having five conserved
blocks (CB) across their amino acid sequence. These are numbered CB1 to
CB5 from the N-terminus to the C-terminus (Ref. 4). The sequences
preceding and following these conserved blocks are highly variable and
are designated as variable regions V1 to V6.
Syngenta Seeds, Incorporated developed Event 5307 maize (Zea mays)
through Agrobacterium-mediated transformation (via plasmid vector PV-
ZMIR245) to express eCry3.1Ab protein for use as a plant-incorporated
protectant (PIP). This proposed PIP is a chimeric Bacillus
thuringiensis protein, composed of portions of Cry1Ab and modified
Cry3A proteins. The eCry3.1Ab protein was genetically engineered via
exchanging the variable regions (V1 to V6) between the mCry3A and the
Cry1Ab proteins for enhanced toxicity against western corn rootworm
(WCR, Diabrotica virgifera). The eCry3.1Ab protein consists of a fusion
between the N-terminus (Domain I, Domain II, and a portion of Domain
III) of mCry3 A and the C-terminus (a portion of Domain III and
variable region 6) of Cry1Ab. The eCry3.1Ab protein is 654 amino acid
residues in size and is approximately 73.7 kilodaltons.
B. Mammalian Toxicity and Allergenicity Assessment
Syngenta has submitted acute oral toxicity data demonstrating the
lack of mammalian toxicity at high levels of exposure to the pure
eCry3.1Ab protein. These data demonstrate the safety of the product at
a level well above maximum possible exposure levels that are reasonably
anticipated in the crop. Basing this conclusion on acute oral toxicity
data without requiring further toxicity testing and residue data is
similar to the Agency position regarding toxicity testing and the
requirement of residue data for the microbial Bacillus thuringiensis
products from which this PIP was derived (see 40 CFR 158.2130(d)(1)(i)
and 158.2140(d)(7)). For microbial products, further toxicity testing
and residue data are triggered by significant adverse acute effects in
studies, such as the mouse oral toxicity study, to verify and quantify
the observed adverse effects and clarify the source of these effects
(Tiers II & III).
An acute oral toxicity study in mice (Master Record Identification
Number MRID No. 477539-01) indicated that eCry3.1Ab is nontoxic. Two
groups of 10 male and 10 female mice were orally dosed (via gavage)
with 2,000 milligrams/kilograms bodyweight (mg/kg bwt) (eCry3.1Ab
protein mg/kg bwt) of the eCry3.1Ab-0208 test substance, the microbial-
produced eCry3.1Ab protein. All treated animals gained weight and had
no test material-related clinical signs and no test material-related
findings at necropsy. Since there were no significant differences
between the test and control groups related to the oral administration
of eCry3.1Ab-0208 test material, the eCry3.1Ab protein does not appear
to cause any significant adverse effects at an exposure level of up to
2,000 mg/kg bwt and supports the finding that the eCry3.1Ab protein
would be nontoxic to mammals.
When proteins are toxic, they are known to act via acute mechanisms
and at very low dose levels (Ref. 8). Therefore, since no acute effects
were shown to be caused by eCry3.1Ab, even at relatively high dose
levels, the eCry3.1Ab protein is not considered toxic. Further, amino
acid sequence comparisons showed no similarities between the eCry3.1Ab
protein and known toxic proteins in protein databases that would raise
a safety concern.
Since eCry3.1Ab is a protein, allergenic sensitivities were
considered. Currently, no definitive tests exist for determining the
allergenic potential of novel proteins. Therefore, EPA uses a ``weight-
of-the-evidence'' approach where the following factors are considered:
Source of the trait; amino acid sequence similarity with known
allergens; prevalence in food; and biochemical properties of the
protein, including in vitro digestibility in simulated gastric fluid
(SGF) and glycosylation (as recommended by CAC 2003, see Ref. 2).
Current scientific knowledge suggests that common food allergens tend
to be resistant to degradation by acid and proteases; may be
glycosylated; and present at high concentrations in the food.
1. Source of the trait. Bacillus thuringiensis is not considered to
be a source of allergenic proteins.
2. Amino acid sequence. A comparison of the amino acid sequence of
eCry3.1Ab with known allergens showed no significant overall sequence
similarity or identity at the level of eight contiguous amino acid
residues. This is the appropriate level of sensitivity to detect
possible IgE epitopes without high false positive rates.
3. Prevalence in food. Preliminary expression level analysis shows
that the eCry.1Ab protein is present at relatively low levels. Dietary
exposure is expected to be correspondingly low. Expression in Event
5307 leaf is 35 parts per million ppm; root is 6 ppm; and pollen is
0.15 ppm. Thus, the expression has been shown to be in the parts per
million range.
4. Digestibility. The eCry3.1Ab protein was rapidly digested in
simulated mammalian gastric fluid containing pepsin at a pH of 1.2 at
37[deg]C. Theestimated degradation rate (DT50) is less than 1 minute
for eCry3.1Ab protein.
5. Glycosylation. The eCry3.1Ab protein expressed in corn was shown
not to be glycosylated.
6. Conclusion. Considering all of the available information, EPA
has concluded that the potential for eCry3.1Ab to be a food allergen is
minimal.
IV. Aggregate Exposures
In examining aggregate exposure, section 408 of FFDCA directs EPA
to consider available information concerning exposures from the
pesticide residue in food and all other non-occupational exposures,
including drinking water from ground water or surface water and
exposure through pesticide use in gardens, lawns, or buildings
(residential and other indoor uses).
The Agency has considered available information on the aggregate
exposure levels of consumers (and major identifiable subgroups of
consumers) to the pesticide chemical residue and to other related
substances. First, with respect to other related substances, the
eCry3.1Ab protein is a chimeric Bacillus thuringiensis protein,
composed of portions of Cry1Ab and mCry3A proteins both of which are
registered PIPs that were previously assessed as having a lack of
mammalian toxicity at high levels of exposure. Exemptions from the
requirement of a tolerance have been established for Cry1Ab in food and
[[Page 34043]]
mCry3A in maize, (see 40 CFR 174.511, effective Apr. 25, 2007 and 40
CFR 174.505, effective Apr. 25, 2007, respectively). Second, and
specific to the eCry3.1Ab protein, these considerations include dietary
exposure under the tolerance exemption and all other tolerances or
exemptions in effect for the PIP chemical residue and exposure from
non-occupational sources. Exposure via the skin or inhalation is not
likely since the PIP is contained within plant cells, which essentially
eliminates these exposure routes or reduces these exposure routes to
negligible. The amino acid homology assessment included similarity to
known aeroallergens. It has been demonstrated that there is no evidence
of occupationally-related respiratory symptoms, based on a health
survey on migrant workers after exposure to Bt pesticides (Ref. 1).
Exposure via residential or lawn use to infants and children is also
not expected because the use sites for the eCry3.1Ab protein are all
agricultural for control of insects. Oral exposure, at very low levels,
may occur from ingestion of processed corn products and, potentially,
drinking water.
However, oral toxicity testing done at a dose of 2 gm/kg showed no
adverse effects. Furthermore, the expected dietary exposure from corn
is several orders of magnitude lower than the amounts of eCry3.1Ab
protein shown to have no toxicity. Therefore, even if negligible
aggregate exposure should occur, the Agency concludes that such
exposure would present no harm due to the lack of mammalian toxicity
and the rapid digestibility demonstrated for the eCry3.1Ab protein.
V. Cumulative Effects from Substances with a Common Mechanism of
Toxicity
Section 408(b)(2)(D)(v) of FFDCA requires that, when considering
whether to establish, modify, or revoke a tolerance, the Agency
consider ``available information'' concerning the cumulative effects of
a particular pesticide's residues and ``other substances that have a
common mechanism of toxicity.''
Since eCry3.1Ab is not considered toxic, EPA has not found
eCry3.1Ab protein to share a common mechanism of toxicity with any
other substances, and eCry3.1Ab protein does not appear to produce a
toxic metabolite produced by other substances. For the purposes of this
tolerance action, therefore, EPA has assumed that eCry3.1Ab protein
does not have a common mechanism of toxicity with other substances.
Following from this, therefore, EPA concludes that there are no
cumulative effects associated with eCry3.1Ab that need to be
considered. For information regarding EPA's efforts to determine which
chemicals have a common mechanism of toxicity and to evaluate the
cumulative effects of such chemicals, see EPA's website at https://www.epa.gov/pesticides/cumulative.
VI. Determination of Safety for the U.S. Population, Infants, and
Children
The data submitted and cited regarding potential health effects for
the eCry3.1Ab protein include the characterization of the expressed
eCry3.1Ab protein in corn, as well as the acute oral toxicity, heat
stability, and in vitro digestibility of the protein. The results of
these studies were used to evaluate human risk, and the validity,
completeness, and reliability of the available data from the studies
were also considered.
As discussed more fully in Unit III. above, the acute oral toxicity
data submitted supports the prediction that the eCry3.1Ab protein would
be nontoxic to humans. Moreover, eCry3.1Ab showed no sequence
similarity to any known toxin. Because of this lack of demonstrated
mammalian toxicity, no protein residue chemistry data for eCry3.1Ab
were required for a human health effects assessment. Even so,
preliminary expression level analysis showed eCry3.1Ab protein is
present at relatively low levels. Dietary exposure is expected to be
correspondingly low.
In addition, since eCry3.1Ab is a protein, its potential
allergenicity was also considered as part of the toxicity assessment.
Data considered as part of the allergenicity assessment include that
the eCry3.1Ab protein came from Bacillus thuringiensis, which is not a
known allergenic source, showed no sequence similarity to known
allergens, was readily degraded by pepsin, and was not glycosylated
when expressed in the plant. Therefore, there is a reasonable certainty
that eCry3.1Ab protein will not be an allergen.
Considered together, the lack of mammalian toxicity at high levels
of exposure to the eCry3.1Ab protein and the minimal potential for that
protein to be a food allergen demonstrate the safety of the product at
levels well above possible maximum exposure levels anticipated in the
crop.
Finally, and specifically in regards to infants and children, FFDCA
section 408(b)(2)(C) provides that EPA shall assess the available
information about consumption patterns among infants and children,
special susceptibility of infants and children to pesticide chemical
residues, and the cumulative effects on infants and children of the
residues and other substances with a common mechanism of toxicity. In
addition, FFDCA section 408(b)(2)(C) provides that EPA shall apply an
additional tenfold margin of safety for infants and children in the
case of threshold effects to account for prenatal and postnatal
toxicity and the completeness of the data base unless EPA determines
that a different margin of safety will be safe for infants and
children.
Based on its review and consideration of all the available
information, as discussed in more detail above, the Agency concludes
that there is a reasonable certainty that no harm will result to the
U.S. population, including infants and children, from aggregate
exposure to residues of the eCry3.1Ab protein and the genetic material
necessary for its production in corn. This includes all anticipated
dietary exposures and all other exposures for which there is reliable
information. The Agency has also concluded, again for the reasons
discussed in more detail above, that there are no threshold effects of
concern and, as a result, that an additional margin of safety for
infants and children is unnecessary in this instance.
VII. Other Considerations
A. Analytical Enforcement Methodology
The Agency has determined that an analytical method is not required
for enforcement purposes since the Agency is establishing an exemption
from the requirement of a tolerance without any numerical limitation.
Nonetheless, a method for extraction and two test strip commercial kits
to detect eCry3.1Ab protein via enzyme-linked immunosorbent assay
analysis in corn have been submitted and are under review by the
Agency.
B. International Residue Limits
In making its tolerance decisions, EPA seeks to harmonize U.S.
tolerances with international standards whenever possible, consistent
with U.S. food safety standards and agricultural practices. In this
context, EPA considers the international maximum residue limits (MRLs)
established by the Codex Alimentarius Commission (Codex), as required
by FFDCA section 408(b)(4). The Codex Alimentarius is a joint U.N. Food
and Agriculture Organization/World Health Organization food standards
program, and it is recognized as an international food safety
standards-setting organization in trade agreements to which the United
States is a party. EPA may establish a tolerance
[[Page 34044]]
that is different from a Codex MRL; however, FFDCA section 408(b)(4)
requires that EPA explain the reasons for departing from the Codex
level. The Codex has not established a MRL for eCry3.1Ab protein in
corn.
C. Response to Comments
One comment was received from an anonymous individual who objected
in general terms to EPA's registration of any pesticides and its
approval of any tolerance or tolerance exemption, claiming that no
safety testing is required or undertaken. While the Agency understands
that some individuals are opposed to all pesticide use, relavant data
(discussed above) did serve as the basis for EPA's conclusion in this
instance that there is a reasonable certainty of no harm from residues
of Bacillus thuringiensis eCry3.1Ab protein in corn.
VIII. Conclusions
The Agency concludes that there is a reasonable certainty that no
harm will result to the U.S. population, including infants and
children, from aggregate exposure to residues of eCry3.1Ab protein in
corn and the genetic material necessary for its production. Therefore,
a temporary exemption is established for residues of Bacillus
thuringiensis eCry3.1Ab protein in or on corn.
IX. References
1. Bernstein IL, Bernstein JA, Miller M, Tierzieva S, Bernstein
DI., Lummus Z, Selgrade MK, Doerfler DL, Seligy VL. 1999. Immune
responses in farm workers after exposure to Bacillus thuringiensis
pesticides. Environmental Health Perspectives. 107(7):575-82.
2. CAC. 2003. Alinorm 03/34: Joint FAO/WHO Food Standard Programme.
Codex Alimentarius Commission, Twenty-Fifth Session, 30 July 2003.
Rome, Italy. Appendix III: Guideline for Conduct of Food Safety
Assessments of Foods Derived from Recombinant-DNA Plants; Appendix IV:
Annex on Assessment of Possible Allergenicity. Codex Alimentarius
Commision, 47-60.
3. Ge A, Rivers D, Milne R, Dean DH. 1991. Functional Domains of
Bacillus thuringiensis Insecticidal Crystal Proteins. Refinement of
Heliothis virescens and Trichoplusiani Specificity Domains on Cry1A(c).
Journal of Biological Chemistry. 266: 17954-17958.
4. Hofte H, Whitley HR. 1989. Insecticidal Crystal Proteins of
Bacillus thuringiensis.. Microbiology Review. 53: 242-255.
5. Honee G, Convents D, Van Rie J, Jansens S, Peferoen M, Visser B.
1991. The C-Terminal Domain of the Toxic Fragment of a Bacillus
thuringiensis Crystal Protein Determines Receptor Binding. Molecular
Microbiology. 5: 2799-2806.
6. Li J, Carroll J, Ellar DJ. 1991. Crystal Structure of
Insecticidal [delta]-Endotoxin from Bacillus thuringiensis at 2.5 A
resolution. Nature. 353: 815-821.
7. Nakamura K, Oshie K, Shimizu M, Takada Y, Oeda K, Ohkawa H.
1990. Construction of Chimeric Insecticidal Proteins Between the 130-
kDa and 135-kDa Proteins of Bacillus thuringiensis subsp. aizawai for
Analysis of Structure-Function Relationship. Agricultural Biological
Chemistry. 54: 715-724.
8. Sjoblad R D, McClintock JT, Engler R. 1992. Toxicological
Considerations for Protein Components of Biological Pesticide Products.
Regulatory Toxicology and Pharmacology. 15(1): 3-9.
X. Statutory and Executive Order Reviews
This final rule establishes a tolerance exemption under section
408(d) of FFDCA in response to a petition submitted to the Agency. The
Office of Management and Budget (OMB) has exempted these types of
actions from review under Executive Order 12866, entitled Regulatory
Planning and Review (58 FR 51735, October 4, 1993). Because this final
rule has been exempted from review under Executive Order 12866, this
final rule is not subject to Executive Order 13211, entitled Actions
Concerning Regulations That Significantly Affect Energy Supply,
Distribution, or Use (66 FR 28355, May 22, 2001), or Executive Order
13045, entitled Protection of Children from Environmental Health Risks
and Safety Risks (62 FR 19885, April 23, 1997). This final rule does
not contain any information collections subject to OMB approval under
the Paperwork Reduction Act (PRA), 44 U.S.C. 3501 et seq., nor does it
require any special considerations under Executive Order 12898,
entitled Federal Actions to Address Environmental Justice in Minority
Populations and Low-Income Populations (59 FR 7629, February 16, 1994).
Since tolerances and exemptions that are established on the basis
of a petition under section 408(d) of FFDCA, such as the tolerance
exemption in this final rule, do not require the issuance of a proposed
rule, the requirements of the Regulatory Flexibility Act (RFA) (5
U.S.C. 601 et seq.) do not apply.
This final rule directly regulates growers, food processors, food
handlers, and food retailers, not States or tribes. As a result, this
action does not alter the relationships or distribution of power and
responsibilities established by Congress in the preemption provisions
of section 408(n)(4) of FFDCA. As such, the Agency has determined that
this action will not have a substantial direct effect on States or
tribal governments, on the relationship between the national government
and the States or tribal governments, or on the distribution of power
and responsibilities among the various levels of government or between
the Federal Government and Indian tribes. Thus, the Agency has
determined that Executive Order 13132, entitled Federalism (64 FR
43255, August 10, 1999), and Executive Order 13175, entitled
Consultation and Coordination with Indian Tribal Governments (65 FR
67249, November 9, 2000), do not apply to this final rule. In addition,
this final rule does not impose any enforceable duty or contain any
unfunded mandate as described under Title II of the Unfunded Mandates
Reform Act of 1995 (UMRA) (Public Law 104-4).
This action does not involve any technical standards that would
require Agency consideration of voluntary consensus standards pursuant
to section 12(d) of the National Technology Transfer and Advancement
Act of 1995 (NTTAA), Public Law 104-113, section 12(d) (15 U.S.C. 272
note).
XI. Congressional Review Act
The Congressional Review Act, 5 U.S.C. 801 et seq., generally
provides that before a rule may take effect, the agency promulgating
the rule must submit a rule report to each House of the Congress and to
the Comptroller General of the United States. EPA will submit a report
containing this rule and other required information to the U.S. Senate,
the U.S. House of Representatives, and the Comptroller General of the
United States prior to publication of this final rule in the Federal
Register. This final rule is not a ``major rule'' as defined by 5
U.S.C. 804(2).
[[Page 34045]]
List of Subjects in 40 CFR Part 174
Environmental protection, Administrative practice and procedure,
Agricultural commodities, Pesticides and pests, Reporting and
recordkeeping requirements.
Dated: June 1, 2010.
Steven Bradbury,
Acting Director, Office of Pesticide Programs.
0
Therefore, 40 CFR chapter I is amended as follows:
PART 174--[AMENDED]
0
1. The authority citation for part 174 continues to read as follows:
Authority: 21 U.S.C. 321(q), 346a and 371.
0
2. Add Sec. 174.532 to subpart W to read as follows:
Sec. 174.532 Bacillus thuringiensis eCry3.1Ab protein in corn;
temporary exemption from the requirement of a tolerance.
Residues of Bacillus thuringiensis eCry3.1Ab protein in corn, in or
on the food and feed commodities of corn; corn, field; corn, sweet; and
corn, pop are exempt temporarily from the requirement of a tolerance
when Bacillus thuringiensis eCry3.1Ab protein in corn is used as a
plant-incorporated protectant in accordance with the terms of
Experimental Use Permit 67979-EUP-8. This temporary exemption from the
requirement of a tolerance expires and is revoked on June 1, 2012.
[FR Doc. 2010-14330 Filed 6-15-10; 8:45 am]
BILLING CODE 6560-50-S