UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE TO

(RULE 14d-100)

Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of

the Securities Exchange Act of 1934

(Amendment No. 3)

________________________

AVIGEN, INC.

(Name of Subject Company)

________________________

BVF ACQUISITION LLC

BIOTECHNOLOGY VALUE FUND, L.P.

BIOTECHNOLOGY VALUE FUND II, L.P.

BVF INVESTMENTS, L.L.C.

INVESTMENT 10, L.L.C.

BVF PARTNERS L.P.

BVF INC.

MARK N. LAMPERT

(Names of Filing Persons—Offeror)

____________________________________

COMMON STOCK, PAR VALUE $0.001 PER SHARE

(Title of Class of Securities)

_________________________

053690103

(CUSIP Number of Class of Securities)

________________________

 MARK N. LAMPERT

Biotechnology Value Fund, L.P.

900 North Michigan Avenue, Suite 1100

Chicago, Illinois 60611

(312) 506-6500

(Name, Address and Telephone Number of Person Authorized to Receive Notices

and Communications on Behalf of Filing Persons)

Copies to:

ADAM W. FINERMAN, ESQ.

Olshan Grundman Frome Rosenzweig & Wolosky LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

Transaction Valuation*	Amount of Filing Fee**
$20,949,515	$823.32

* Estimated for purposes of calculating the amount of filing fee only. Transaction value derived by multiplying 20,949,515 (the maximum number of shares of common stock of subject company estimated to be acquired by Offeror) by $1.00 (the purchase price per share offered by Offeror).

** The amount of the filing fee, calculated in accordance with Rule 0-11 of the Securities Exchange Act of 1934, as amended, equals $39.30 per $1,000,000 of the value of the transaction.

x Check box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

Amount Previously Paid:	$823.32	Filing Party:	BVF Acquisition LLC
Form or Registration No.:	Schedule TO-T	Date Filed:	January 23, 2009

¨  Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the statement relates:

x    third-party tender offer subject to Rule 14d-1.

¨    issuer tender offer subject to Rule 13e-4.

¨    going-private transaction subject to Rule 13e-3.

¨    amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer.    ¨

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

¨ Rule 13e-4(i) (Cross-Border Issuer Tender Offer)

o  Rule 14d-1(d) (Cross-Border Third-Party Tender Offer) 

This Amendment No. 3 (this “Amendment”) amends and supplements the Tender Offer Statement on Schedule TO (the “Schedule TO”), originally filed by BVF Acquisition LLC (the “Purchaser”) with the Securities and Exchange Commission on January 23, 2009, as amended on February 2, 2009, as further amended on February 6, 2009, relating to the offer by the Purchaser to purchase all of the outstanding shares of common stock, par value $0.001 per share (the “Shares”), of Avigen, Inc., a Delaware corporation (the “Company”), at $1.00 per Share, net to the seller in cash, without interest, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated January 23, 2009, as amended (the “Offer to Purchase”), and in the related Letter of Transmittal, copies of which were filed as Exhibits (a)(1)(i) and (a)(1)(ii) to the Schedule TO. All references to Sections in this Amendment are to Sections of the Offer to Purchase. Capitalized terms used and not otherwise defined in this Amendment shall have the meanings assigned to them in the Offer to Purchase or the Schedule TO, as applicable.

All information set forth in the Offer to Purchase filed as Exhibit (a)(1)(i) to the Schedule TO is incorporated by reference in answer to Items 1 through 11 in the Schedule TO, except those items as to which information is specifically provided herein.

Items 1 through 9.

The Expiration Date of the Offer has been extended to 6:00 p.m., New York City time, on March 6, 2009. All references in the Offer to Purchase, Letter of Transmittal, the Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees, and the Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees, to the Expiration Date as 12:00 midnight, New York City time, on February 23, 2009, are hereby amended and restated to refer to the Expiration Date as 6:00 p.m., New York City time, on March 6, 2009.

Item 11. Additional Information.

On February 20, 2009, the Purchaser issued a press release announcing that it had extended the Expiration Date of the Offer to 6:00 p.m., New York City time, on March 6, 2009. As of the close of business on February 20, 2009, 1,132,192 Shares of the Company have been tendered in and not withdrawn from the Offer. The press release issued by the Purchaser is attached hereto as Exhibit (a)(5)(iv).

Item 12.    Exhibits.

Item 12 of the Schedule TO is hereby amended and supplemented to include the following:

     “(a)(5)(iv) Text of Press Release issued by the Purchaser, dated February 20, 2009.”

SIGNATURE

After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated:  February 23, 2009

BVF ACQUISITION LLC
By:	Biotechnology Value Fund, L.P., a member
	By:	BVF Partners L.P., its general partner
		By:	BVP Inc., its general partner
By:	/s/ Mark N. Lampert
	Mark N. Lampert
	President

BIOTECHNOLOGY VALUE FUND, L.P.
By:	BVF Partners L.P., its general partner
	By:	BVF Inc., its general partner
		By:	/s/ Mark N. Lampert
			Mark N. Lampert
			President

BIOTECHNOLOGY VALUE FUND II, L.P.
By:	BVF Partners L.P., its general partner
	By:	BVF Inc., its general partner
		By:	/s/ Mark N. Lampert
			Mark N. Lampert
			President

BVF INVESTMENTS, L.L.C.
By:	BVF Partners L.P., its manager
	By:	BVF Inc., its general partner
		By:	/s/ Mark N. Lampert
			Mark N. Lampert
			President

INVESTMENT 10, L.L.C.
By:	BVF Partners L.P., its investment manager
	By:	BVF Inc., its general partner
		By:	/s/ Mark N. Lampert
			Mark N. Lampert
			President

BVF PARTNERS L.P.
By:	BVF Inc., its general partner
	By:	/s/ Mark N. Lampert
		Mark N. Lampert
		President

BVF INC.
By:	/s/ Mark N. Lampert
	Mark N. Lampert
	President

/s/ Mark N. Lampert   

MARK N. LAMPERT

EXHIBIT INDEX

(a)(1)(i)	Offer to Purchase, dated January 23, 2009.*
(a)(1)(ii)	Form of Letter of Transmittal.*
(a)(1)(iii)	Form of Notice of Guaranteed Delivery.*
(a)(1)(iv)	Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.*
(a)(1)(v)	Form of Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.*
(a)(1)(vi)	Guidelines for Certification of Taxpayer Identification Number on Substitute Form W-9.*
(a)(1)(vii)	Form of summary advertisement, dated January 23, 2009.*
(a)(5)(i)	Text of press release issued by Purchaser, dated January 23, 2009.*
(a)(5)(ii)	Text of Press Release issued on January 15, 2009, incorporated by reference from Schedule TO filed by BVF Acquisition LLC on January 15, 2009.**
(a)(5)(iii)	Text of Press Release issued by the Purchaser, dated February 6, 2009.***
(a)(5)(iv)	Text of Press Release issued by the Purchaser, dated February 20, 2009.
(b)	Not applicable.
(d)	Not applicable.
(g)	Not applicable.
(h)	Not applicable.

_____________________

*           Previously filed on January 23, 2009.

**         Previously filed on January 15, 2009.

***       Previously filed on February 6, 2009.