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                                                                   Exhibit 10.12

                                 METABOLIX, INC.

         EMPLOYEE NONCOMPETITION, NONDISCLOSURE AND INVENTIONS AGREEMENT

     The undersigned in consideration and as a condition of my employment and
continued employment or, to the extent already employed on the date hereof, my
continued employment, by Metabolix, Inc. (the "Company"), a corporation
organized under the laws of the Commonwealth of Massachusetts, does hereby agree
with the Company as follows:

1. NON-COMPETITION. During my employment by the Company, I will devote my full
time and best efforts to the business of the Company and I further agree that
during my employment by the Company and for a period of two (2) years
thereafter, I will not directly or indirectly: (i) alone or as a partner, joint
venturer, consultant, officer, director, employee, agent, independent contractor
or stockholder of any company or business organization, engage in any business
activity [which is or may be directly or indirectly in competition with the
products or services being developed, manufactured, marketed, distributed,
planned, sold or otherwise provided by the Company or which is in any way
directly or indirectly detrimental to the business of the Company] [in the Field
(as hereinafter defined]; provided, however, that the record or beneficial
ownership by me of 1% or less of the outstanding publicly traded capital stock
of any such company or business organization shall not be deemed, in and of
itself, to be in violation of this Section 1, provided that I am not a partner,
joint venturer, officer, director, employee, agent, independent contractor or
consultant of such company or business organization; or (ii) employ, or
knowingly permit any company or business organization by which I am employed or
which is directly or indirectly controlled by me to employ, any person who is
employed by the Company, or is an agent, representative or consultant of the
Company[, at any time during my employment or during the period of two (2) years
thereafter] [within the three (3) month period before and after the termination
of my employment], or in any manner seek to solicit or induce any such person to
leave his or her employment with the Company or assist in the recruitment of any
such person. [For purposes of this section, "Field" is defined as methods of
production, application and use of polyhydroxyalkanoates, their derivatives and
other technology developed by the Company.]

2. NONDISCLOSURE. I will not, whether during or after the termination of my
employment, reveal to any person, association, company, entity or other
organization any of the trade secrets or confidential information concerning the
organization, research and development activities, marketing plans and
strategies, business or finances, of the Company or of any third party to whom
the Company is under an obligation of confidentiality (including but not limited
to trade secrets or confidential information respecting inventions, products,
research and development activities, designs, methods, know-how, techniques,
processes, plans and proposals) except as may be required in the ordinary course
of performing my duties as an employee of the Company or except as may be in the
public domain through no fault of mine, and I shall keep secret all matters
entrusted to me and shall not use any such information in any manner which may
injure or cause loss whether directly or indirectly to the Company.

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     Further, I agree that, during my employment I shall not make, use or permit
to be used any notes, memoranda, drawings, specification, programs, data, lab
results, lab notes, formulas, codes or other materials of any nature relating to
any matter within the scope of the business of the Company or concerning any of
its dealings or affairs otherwise than for the benefit of the Company. I further
agree that I shall not, after the termination of my employment, use or permit to
be used any such notes, memoranda, drawings, specification, programs, data, lab
results, lab notes, formulas, codes or other materials, it being agreed that all
of the foregoing are and shall be confidential information or trade secrets of
the Company and shall be and remain the sole and exclusive property of the
Company, and immediately upon the termination of my employment I shall deliver
all of the foregoing, and all copies thereof, to the Company, at its main
office.

3. INVENTIONS AND DEVELOPMENTS. If at any time or times during my employment I
(either alone or with others) make, conceive, discover, reduce to practice or
become possessed of any invention, modification, discovery, design, development,
improvement, process, formula, cell code, data, technique, know-how, trade
secret, work of authorship or intellectual property right whatsoever or any
interest therein (whether or not patentable or registrable under copyright or
similar statutes or subject to analogous protection), including but not limited
to any of the foregoing which relate to the metabolic engineering of
polyhydroxyalkanoates (all of the foregoing called "Inventions" and any of the
foregoing called an "Invention") that (a) relates to the business of the Company
or any of the products or services being developed, manufactured or sold by the
Company or which may be conveniently used in connection therewith, or (b)
results from tasks assigned to me by the Company, or (c) results from the use of
premises owned, leased or contracted for by the Company, such Inventions and the
benefits thereof shall immediately become the sole and absolute property of the
Company and its assigns, as works made for hire or otherwise, and I shall
promptly disclose to the Company (or any persons designated by it) each such
Invention and hereby assign to the Company any rights I may have or acquire in
the Inventions and benefits and/or rights resulting therefrom to the Company
without compensation and shall communicate, without cost or delay, and without
publishing the same all available information relating thereto (with all
necessary plans and models) to the Company.

     I will also promptly disclose to the Company (or any persons designated by
it), and the Company hereby agrees to receive all such disclosures in
confidence, any other invention, modification, discovery, design, development,
improvement, process, formula, code, data, technique, know-how, trade secret,
work of authorship or intellectual property right whatsoever or any interest
therein (whether or not patentable or registrable under copyright or similar
statutes) made, conceived, discovered, reduced to practice or possessed by me
(either alone or with others) at any time or times during my employment, for the
purposes of determining whether they constitute "Inventions" as defined herein.

     Upon disclosure of each Invention to the Company, during my employment and
at any time thereafter I will, at the request and cost of the Company, sign,
execute, make and do all such deeds, documents, acts and things as the Company
and its duly authorized agents may reasonably require:

(a) to apply for, obtain and vest in the name of the Company alone (or as the
Company otherwise directs) and to defend, enforce and maintain any patents,
patent applications, copyrights, or other

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analogous protection in any country throughout the world and when so obtained or
vested to renew and restore the same; and

(b) to defend any opposition proceedings in respect of such applications and any
opposition proceedings or petitions or applications for revocation of such
letters patent, copyrights or other analogous protection.

     If the Company is unable, after reasonable effort, to secure my signature
on any such letters patent, copyrights or other analogous protection to an
Invention, whether because of my physical or mental incapacity or for any other
reason whatsoever, I hereby irrevocably designate and appoint the Company and
its duly authorized officers and agents as my agent and attorney-in-fact, to act
for and in my behalf and stead to execute and file any such application or
applications and to do all other lawfully permitted acts to further the
prosecution and issuance of letters patent, copyright or other analogous
protection thereon with the same legal force and effect as if executed by me.

4. I represent that the inventions identified in the pages, if any, attached
hereto comprise all the inventions which I have made or conceived prior to my
employment by the Company, which inventions are excluded from this Agreement. I
understand that it is only necessary to list the title of such inventions and
the purposes thereof, but not the details of the invention itself. IF THERE ARE
ANY SUCH INVENTIONS TO BE EXCLUDED, THE UNDERSIGNED SHOULD INITIAL HERE.
OTHERWISE IT WILL BE DEEMED THAT THERE ARE NO SUCH EXCLUSIONS. _____.

The parties acknowledge that pages ___ through ____ attached hereto are the only
pages attached in response to this Section 4.

5. Except as provided in the next paragraph of this Section 5, I represent that
my performance of the terms of this Agreement, and my performance of my duties
as an employee of the Company, does not and will not breach any agreement to
which I am bound, including without limitation any agreement to keep in
confidence proprietary information acquired by me in confidence or in trust
prior to my employment by the Company. I have not entered into, and I agree that
I will not enter into, any agreement, either written or oral, in conflict
herewith.

If the representations set forth in the preceding paragraph are inapplicable, I
have attached hereto a copy of each agreement, if any, which presently affects
my compliance with the terms of this Agreement. (Such copy specifies the other
contracting party or employer, the date of such agreement, the date of
termination of any employment.) IF THERE ARE ANY SUCH AGREEMENTS, THE
UNDERSIGNED SHOULD INITIAL HERE. OTHERWISE IT WILL BE DEEMED THAT THERE ARE NO
SUCH AGREEMENTS. _____.

The parties acknowledge that pages ___ through ____ attached hereto are the only
pages attached in response to this Section 5.

6. Miscellaneous. I agree that any breach of this Agreement by me will cause
irreparable damage to the Company, and that in the event of such breach the
Company shall have, in addition to any and all remedies of law, the right to an
injunction, specific performance or other equitable relief to prevent the
violation of my obligations hereunder.

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7. I understand that this Agreement does not create an obligation on the Company
or any other person to continue my employment.

8. Any amendment to or modification of this Agreement, and any waiver of any
provision hereof, shall be in writing and shall be signed by the parties hereto.
Any waiver by the Company of a breach of any provision of this Agreement shall
not operate or be construed as a waiver of any subsequent breach hereof.

9. I hereby agree that each provision herein shall be treated as a separate and
independent clause, and the unenforceability of any one clause shall in no way
impair the enforceability of any of the other clauses herein. Moreover, if any
one or more of the provisions contained in this Agreement shall for any reason
be held to be excessively broad as to scope, activity or subject so as to be
unenforceable at law, such provision or provisions shall be construed by the
appropriate judicial body by limiting and reducing it or them, so as to be
enforceable to the maximum extent compatible with the applicable law as it shall
then appear. I hereby further agree that the language of all parts of this
Agreement shall in all cases be construed as a whole according to its fair
meaning and not strictly for or against any of the parties.

10. No claim of mine against the Company shall serve as a defense against the
Company's enforcement of any provision of this Agreement.

11. Except as otherwise provided in Section 1, my obligations under this
Agreement shall survive the termination of my employment, regardless of the
manner of such termination, and shall be binding upon my heirs, executors,
administrators and legal representatives.

11. The term "Company" shall include Metabolix, Inc., a corporation organized
under the laws of the Commonwealth of Massachusetts, and any of its
subsidiaries, divisions, or affiliates. The Company shall have the right to
assign this Agreement to its successors and assigns, and all covenants and
agreements hereunder shall inure to the benefit of and be enforceable by such
successors and assigns.

12. This Agreement shall be deemed to be made and entered into in the
Commonwealth of Massachusetts, and shall in all respects be interpreted,
enforced and governed under the internal and domestic laws of such Commonwealth
without giving effect to the principles of conflict of law of such Commonwealth.

IN WITNESS WHEREOF, the undersigned has executed this Agreement as of the ____
day of ____________, 200__.

                                        ----------------------------------------
                                        Signature

                                        Name:
                                              ----------------------------------
                                        Address:
                                                 -------------------------------
                                        ----------------------------------------

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Agreed to and Accepted :

METABOLIX, INC.

By:
    ---------------------------------
Title:

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                                                                   Exhibit 10.13

                                 METABOLIX, INC.

        EMPLOYEE NONCOMPETITION, CONFIDENTIALITY AND INVENTIONS AGREEMENT

     The undersigned ______________________________________________ [print
name], in consideration and as a condition of my employment and continued
employment by Metabolix, Inc. (the "Company"), a Delaware corporation, does
hereby agree with the Company as follows:

1. NONCOMPETITION AND NONSOLICITATION. During my employment by the Company and
for a period of two (2) years thereafter, I will not directly or indirectly: (i)
alone or as a partner, joint venturer, consultant, officer, director, employee,
agent, independent contractor or stockholder of any company or business
organization, engage in any business activity which is directly or indirectly in
competition with the products or services being developed, manufactured,
marketed, distributed, planned, sold or otherwise provided by the Company or
which is in any way directly or indirectly detrimental to the business of the
Company; provided, however, that the record or beneficial ownership by me of 1%
or less of the outstanding publicly traded capital stock of any such company or
business organization shall not be deemed, in and of itself, to be in violation
of this Section 1; or (ii) employ, or knowingly permit any company or business
organization by which I am employed or which is directly or indirectly
controlled by me to employ, any person who is employed by the Company, or is an
agent, representative or consultant of the Company, or in any manner seek to
solicit or induce any such person to leave his or her employment with the
Company or assist in the recruitment of any such person; or (iii) directly or
indirectly solicit the business of any customer of the Company (other than on
behalf of the Company); [provided, that if the Company has multiple groups or
divisions engaged in separate lines of business, the foregoing shall apply only
to customers of any group or division in which I am employed;] nor shall I
directly or indirectly induce any customer, supplier, vendor, consultant or
independent contractor of the Company to terminate or negatively alter his, her
or its relationship with the Company.

2. CONFIDENTIALITY. I will not at any time, whether during or after the
termination of my employment, reveal to any person, association, company, entity
or other organization any of the trade secrets or confidential information of
the Company or of any third party to whom the Company is under an obligation of
confidentiality (including but not limited to trade secrets or confidential
information respecting inventions, products, research and development
activities, designs, methods, know-how, techniques, processes, plans and
proposals, marketing and selling, business plans, budgets and unpublished
financial statements, licenses, prices and costs, suppliers and customers)
except as may be required in the ordinary course of performing my duties as an
employee of the Company. Further, I shall not use any such information except as
required in the performance of my duties for the Company. Without limiting the
generality of the foregoing, I shall not use any such information for my
personal benefit or in any manner which may injure or cause loss, whether
directly or indirectly, to the Company.

     Further, I agree that, during my employment I shall not make, use or permit
to be used any notes, memoranda, drawings, specification, programs, data, lab
results, lab notes, formulas,

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codes or other materials of any nature relating to any matter within the scope
of the business of the Company or concerning any of its dealings or affairs
otherwise than for the benefit of the Company. I further agree that I shall not,
after the termination of my employment, use or permit to be used any such
materials, it being agreed that all of the foregoing are and shall be
confidential information or trade secrets of the Company and shall be and remain
the sole and exclusive property of the Company, and immediately upon the
termination of my employment I shall deliver all of the foregoing, and all
copies thereof, to the Company. [The restrictions set forth in this Section 2
will not apply to information which I can establish was known to me prior to my
employment with the Company or which is generally known now or in the future to
the public or in the trade, unless such knowledge results from an unauthorized
disclosure by me, but these exceptions will not affect the application of any
other provision of this Agreement to such information in accordance with the
terms of such provision.]

3. INVENTIONS AND INTELLECTUAL PROPERTY. If at any time or times during my
employment I (either alone or with others) make, conceive, discover, reduce to
practice or become possessed of any Intellectual Property, as hereinafter
defined, such Intellectual Property shall be the sole and absolute property of
the Company, as works made for hire or otherwise, and I hereby assign to the
Company all of my rights in such Intellectual Property. For purposes hereof,
"Intellectual Property" shall mean any invention, modification, discovery,
design, development, improvement, process, formula, code, data, technique,
know-how, trade secret, work of authorship or intellectual property right
whatsoever or any interest therein (whether or not patentable or registrable
under copyright or similar statutes) that (a) relates to the field of metabolic
engineering of polyhydroxyalkanoates or any other business of the Company or any
of the products or services being developed, manufactured or sold by the Company
or which may be useful in connection therewith, or (b) results from tasks
assigned to me by the Company, or (c) results from the use of facilities owned,
leased or contracted for by the Company.

     I shall promptly disclose to the Company (or any persons designated by it)
all such Intellectual Property and any information relating thereto. I shall
also promptly disclose to the Company, and the Company hereby agrees to receive
all such disclosures in confidence, any other invention, modification,
discovery, design, development, improvement, process, formula, code, data,
technique, know-how, trade secret, work of authorship or intellectual property
right whatsoever or any interest therein (whether or not patentable or
registrable under copyright or similar statutes) made, conceived, discovered,
reduced to practice or possessed by me (either alone or with others) at any time
or times during my employment, for the purposes of determining whether they
constitute "Intellectual Property" as defined above.

     During my employment and at any time thereafter I will, at the request and
cost of the Company, sign, execute, make and do all such deeds, documents, acts
and things as the Company and its duly authorized agents may reasonably require
to apply for, obtain and vest in the name of the Company alone (or as the
Company otherwise directs) and to defend, enforce and maintain any patents,
patent applications, copyrights, or other analogous protection with respect to
the Intellectual Property in any country throughout the world.

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     If the Company is unable, after reasonable effort [within five (5) calendar
days written request], to secure my signature on any such application or other
document relating to any Intellectual Property, whether because of my physical
or mental incapacity or for any other reason whatsoever, I hereby irrevocably
designate and appoint the Company and its duly authorized officers and agents as
my agent and attorney-in-fact, to act for and in my behalf and stead to execute
and file any such application(s) or document(s) and to do all other lawfully
permitted acts to further the prosecution and issuance of letters patent,
copyright or other analogous protection thereon with the same legal force and
effect as if executed by me.

4. Prior Inventions. I represent that the inventions identified in the pages, if
any, attached hereto comprise all the inventions which I have made or conceived
prior to my employment by the Company, which inventions are excluded from this
Agreement. I understand that it is only necessary to list the title of such
inventions and the purposes thereof, but not the details of the invention
itself.

IF THERE ARE ANY SUCH INVENTIONS TO BE EXCLUDED, THE UNDERSIGNED SHOULD INITIAL
HERE. OTHERWISE IT WILL BE DEEMED THAT THERE ARE NO SUCH EXCLUSIONS. _____.

The parties acknowledge that pages ___ through ____ attached hereto are the only
pages attached in response to this Section 4.

5. No Conflict. Except as provided in the next paragraph of this Section 5, I
represent that my performance of the terms of this Agreement, and my performance
of my duties as an employee of the Company, does not and will not breach any
agreement to which I am bound, including without limitation any agreement to
keep in confidence proprietary information acquired by me in confidence or in
trust prior to my employment by the Company. I have not entered into, and I
agree that I will not enter into, any agreement, either written or oral, in
conflict herewith. During my employment by the Company, I will not improperly
use or disclose any confidential information or trade secrets, if any, of any
former employer or any other person to whom I have an obligation of
confidentiality, and I will not bring onto the premises of the Company any
unpublished documents or any property belonging to any former employer or any
other person to whom I have an obligation of confidentiality unless consented to
in writing by that former employer or person. I will use in the performance of
my duties only information which is generally known and used by persons with
training and experience comparable to my own, which is common knowledge in the
industry or otherwise legally in the public domain, or which is otherwise
provided or developed by the Company.

I have attached hereto a copy of each agreement, if any, which presently affects
my compliance with the terms of this Agreement. IF THERE ARE ANY SUCH
AGREEMENTS, THE UNDERSIGNED SHOULD INITIAL HERE. OTHERWISE IT WILL BE DEEMED
THAT THERE ARE NO SUCH EXCLUSIONS. _____.

The parties acknowledge that pages ___ through ____ attached hereto are the only
pages attached in response to this Section 5.

6. Specific Performance. I agree that any breach of this Agreement by me will
cause irreparable damage to the Company, and that in the event of such breach
the Company shall have, in

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addition to any and all remedies of law, the right to an injunction, specific
performance or other equitable relief to prevent the violation of my obligations
hereunder.

7. No Employment Obligation. I understand that this Agreement does not create an
obligation on the Company or any other person to continue my employment.

8. Amendments. Any amendment to or modification of this Agreement, and any
waiver of any provision hereof, shall be in writing and shall be signed by the
parties hereto. Any waiver by the Company of a breach of any provision of this
Agreement shall not operate or be construed as a waiver of any subsequent breach
hereof.

9. Severability. I hereby agree that each provision herein shall be treated as a
separate and independent clause, and the unenforceability of any one clause
shall in no way impair the enforceability of any of the other clauses herein.
Moreover, if any one or more of the provisions contained in this Agreement shall
for any reason be held to be excessively broad as to scope, activity or subject
so as to be unenforceable at law, such provision or provisions shall be
construed by the appropriate judicial body by limiting and reducing it or them,
so as to be enforceable to the maximum extent compatible with the applicable law
as it shall then appear. I hereby further agree that the language of all parts
of this Agreement shall in all cases be construed as a whole according to its
fair meaning and not strictly for or against any of the parties. No claim of
mine against the Company shall serve as a defense against the Company's
enforcement of any provision of this Agreement.

10. Survival. Except as otherwise provided in Section 1, my obligations under
this Agreement shall survive the termination of my employment, regardless of the
manner of such termination, and shall be binding upon my heirs, executors,
administrators and legal representatives.

11. Successors. The term "Company" shall include Metabolix, Inc., a Delaware
corporation, and any of its subsidiaries, divisions, or affiliates. The Company
shall have the right to assign this Agreement to its successors and assigns, and
all covenants and agreements hereunder shall inure to the benefit of and be
enforceable by such successors and assigns[provided, however, that in the event
of such an assignment to a company or entity that is engaged in more than one
line of business, the covenant against competition set forth in Section 1(i)
above shall apply only with respect to business activities which are directly or
indirectly in competition with the division or group of the successor entity
which includes the Company or its assets].

12. Governing Law. This Agreement shall be deemed to be made and entered into in
the Commonwealth of Massachusetts, and shall in all respects be interpreted,
enforced and governed under the internal and domestic laws of such Commonwealth
without giving effect to the principles of conflict of law of such Commonwealth.

EXECUTED as of the ____ day of ____________, 200__.

                                        ----------------------------------------
                                        Signature

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                                        Name:
                                              ----------------------------------
                                        Address:
                                                 -------------------------------
                                        ----------------------------------------

Accepted and Agreed:

METABOLIX, INC.

By:
    ---------------------------------
Title:

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