Security	Date	Code	Shares	A/D	Owned after	D/I	Nature of ownership
Common Stock, $0.001 par value^F1,F2	holding	—	—	—	425,417	I	See Explanation of Reponses
Common Stock, $0.001 par value^F1,F3	holding	—	—	—	244,843	I	See Explanation of Reponses
Common Stock, $0.001 par value^F1,F4	holding	—	—	—	161,480	I	See Explanation of Reponses
Common Stock, $0.001 par value^F1,F5,F6	holding	—	—	—	49,926	I	See Explanation of Reponses

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1This Form 4 is filed jointly by Biotechnology Value Fund, L.P. ("BVF"), Biotechnology Value Fund II, L.P. ("BVF2"), Investment 10 L.L.C. ("ILL10"), BVF Investments, L.L.C. ("BVFLLC"), BVF Partners L.P. ("Partners"), BVF Inc. and Mark N. Lampert (collectively, the "Reporting Persons"). Each of the Reporting Persons is a member of a Section 13G group that no longer owns more than 10% of the Issuer's outstanding shares of Common Stock pursuant to Rule 16a-1(a)(1). Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein.
F2Represents shares of Common Stock owned directly by BVF. As the general partner of BVF, Partners may be deemed to beneficially own the shares of Common Stock owned directly by BVF. As the investment adviser and general partner of Partners, BVF Inc., may be deemed to beneficially own the shares of Common Stock owned directly by BVF. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the shares of Common Stock owned directly by BVF.
F3Represents shares of Common Stock owned directly by BVF2. As the general partner of BVF2, Partners may be deemed to beneficially own the shares of Common Stock owned directly by BVF2. As the investment adviser and general partner of Partners, BVF Inc., may be deemed to beneficially own the shares of Common Stock owned directly by BVF2. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the shares of Common Stock owned directly by BVF2.
F4Represents shares of Common Stock owned directly by ILL10. As the investment adviser of ILL10, Partners may be deemed to beneficially own the shares of Common Stock owned directly by ILL10. As the investment adviser and general partner of Partners, BVF Inc., may be deemed to beneficially own the shares of Common Stock owned directly by ILL10. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the shares of Common Stock owned directly by ILL10.
F5Represents shares of Common Stock owned directly by BVFLLC. As the manager of BVFLLC, Partners may be deemed to beneficially own the shares of Common Stock owned directly by BVFLLC. As the investment adviser and general partner of Partners, BVF Inc., may be deemed to beneficially own the shares of Common Stock owned directly by BVFLLC. As a director and officer of BVF Inc., Mr. Lampert may be deemed to beneficially own the shares of Common Stock owned directly by BVFLLC.
F6The shares of Common Stock are directly beneficially owned by BVFLLC, a Delaware limited liability company. Pursuant to the operating agreement of BVFLLC, BVF Partners, L.P., a Delaware limited partnership is authorized, among other things, to invest the contributed capital of Samana Capital, L.P., the majority member of BVFLLC, in the shares of Common Stock and other securities and to vote, exercise or convert and dispose of such securities and is entitled to receive fees based on assets under management and, subject to certain exceptions, allocations based on realized and unrealized gains on such assets.