SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* KELLOGG PETER N (Last) (First) (Middle) C/O METABOLIX, INC. 21 ERIE STREET (Street) CAMBRIDGE MA 02139 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 03/30/2007	3. Issuer Name and Ticker or Trading Symbol METABOLIX, INC. [ MBLX ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Sarah P. Cecil, Attorney-in-Fact	04/10/2007
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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Exhibit 24

POWER OF ATTORNEY

	KNOW ALL MEN BY THESE PRESENTS, that the
undersigned hereby constitutes and appoints Thomas G.
Auchincloss, Jr., Aninda Katragadda, Sarah Cecil,
Christopher J. Denn, John M. Mutkoski, and Robert E.
Puopolo, and any one of them acting singly, the true
and lawful attorneys-in-fact and agents, with full
power of substitution and resubstitution, for the
undersigned and in the undersigned's name, place and
stead, in any and all capacities (until revoked in
writing) to execute for and on behalf of the
undersigned, in any and all of the undersigned's
capacities, any and all statements on Forms 3, 4 and 5
with respect to the undersigned's holdings of and
transactions in securities issued by Metabolix, Inc.
(the "Company") in accordance with Sections 16(a) of
the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and any and all regulations
promulgated thereunder, and to file the same, with all
exhibits thereto, and any other documents in
connection therewith, with the Securities and Exchange
Commission, and with any other entity when and if such
is mandated by the Exchange Act or by the By-laws of
the National Association of Securities Dealers,
granting unto said attorneys-in-fact and agents full
power and authority to do and perform each and every
act and thing requisite and necessary fully to all
intents and purposes as the undersigned might or could
do in person thereby ratifying and confirming all that
said attorneys-in-fact and agents, or their substitute
or substitutes, may lawfully do or cause to be done by
virtue hereof.

	This Power of Attorney shall remain in full force
and effect until the undersigned is no longer required
to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in
securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, this Power of Attorney has
been signed as of April 9, 2007.


Signature:	/s/ Peter N. Kellogg

Name:  Peter N. Kellogg