SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* OXFORD BIOSCIENCE PARTNERS IV LP (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Trubion Pharmaceuticals, Inc [ TRBN ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 10/17/2006
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/17/2006		P		41,201	A	$13	41,201	D(1)
Common Stock	10/17/2006		P		413	A	$13	413	D(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* OXFORD BIOSCIENCE PARTNERS IV LP (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* MRNA FUND II LP (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BARNES JEFFREY T (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CARTHY MARK (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* FLEMING JONATHAN (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* LYTTON MICHAEL (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* WALTON ALAN G (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* OBP MANAGEMENT IV LP (Last) (First) (Middle) 222 BERKELEY ST. (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Securities held of record by Oxford Bioscience Partners IV L.P. ("Oxford IV"). OBP Management IV L.P. ("OBP IV"), as the sole general partner of Oxford IV may be deemed to beneficially own certain of the shares held of record by Oxford IV. OBP IV disclaims beneficial ownership of all shares held of record by Oxford IV in which OBP IV does not have an actual pecuniary interest. Each of Messrs. Barnes, Carthy, Fleming, Lytton and Walton, as the individual general partners of OBP IV, may be deemed to beneficially own certain of the shares held of record by Oxford IV. Each of Messrs. Barnes, Carthy, Fleming, Lytton and Walton disclaims beneficial ownership of all shares held of record by Oxford IV in which he does not have an actual pecuniary interest.

2. Securities held of record by mRNA Fund II L.P. ("mRNA"). OBP IV, as the sole general partner of mRNA may be deemed to beneficially own certain of the shares held of record by mRNA. OBP IV disclaims beneficial ownership of all shares held of record by mRNA in which OBP IV does not have an actual pecuniary interest. Each of Messrs. Barnes, Carthy, Fleming, Lytton and Walton, as the individual general partners of OBP IV, may be deemed to beneficially own certain of the shares held of record by mRNA. Each of Messrs. Barnes, Carthy, Fleming, Lytton and Walton disclaims beneficial ownership of all shares held of record by mRNA in which he does not have an actual pecuniary interest.

Remarks:

	/s/ Jonathan J. Fleming, as general partner of the general partner of Oxford Bioscience Partners IV L.P.	10/19/2006
	/s/ Jonathan J. Fleming, as general partner of the general partner of mRNA Fund II L.P.	10/19/2006
	/s/ Jonathan J. Fleming, as general partner of OBP Management IV L.P.	10/19/2006
	/s/ Jonathan J. Fleming	10/19/2006
	/s/ Raymond Charest, as attorney-in-fact for Jeffrey T. Barnes	10/19/2006
	/s/ Raymond Charest, as attorney-in-fact for Mark P. Carthy	10/19/2006
	/s/ Raymond Charest, as attorney-in-fact for Michael E. Lytton	10/19/2006
	/s/ Raymond Charest, as attorney-in-fact for Alan G. Walton	10/19/2006
	** Signature of Reporting Person	Date
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