X0202 4 2007-11-09 1 0001114529 VIACELL INC VIAC 0000918923 BIOTECHNOLOGY VALUE FUND L P 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 0 1 Direct Beneficial Owner 0001102444 BIOTECHNOLOGY VALUE FUND II LP 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 0 1 Direct Beneficial Owner 0001132245 BVF INVESTMENTS LLC 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 1 1 Direct Beneficial Owner 0001056807 BVF INC/IL ONE SANSOME STREET, 31ST FLOOR SAN FRANCISCO CA 94104 0 0 1 1 Indirect Beneficial Owner 0001055947 BVF PARTNERS L P/IL ONE SANSOME STREET, 31ST FLOOR SAN FRANCISCO CA 94104 0 0 1 1 Indirect Beneficial Owner Common Stock 2007-11-09 4 S 0 1683900 7.25 D 0 I See footnotes Common Stock 2007-11-09 4 S 0 1151000 7.25 D 0 I See footnotes Common Stock 2007-11-09 4 S 0 4471000 7.25 D 0 I See footnotes The shares reported in this response are indirectly beneficially owned by BVF Partners L.P., a Delaware limited partnership ("Partners"), the designated filer of this joint filing on Form 4, and by its general partner, BVF Inc., a Delaware corporation ("BVF Inc."), which is also an investment advisor to Partners. Partners is the general partner of Biotechnology Value Fund, L.P., a Delaware limited partnership ("BVF, L.P.") and Biotechnology Value Fund II, L.P., a Delaware limited partnership ("BVF2, L.P."), both investment limited partnerships. Partners also is the manager of BVF Investments, L.L.C., a Delaware limited liability company ("Investments"). Pursuant to the operating agreement of Investments, Partners is authorized, among other things, to invest the funds of Ziff Asset Management, L.P., the majority member of Investments, in the shares of Common Stock reported in Table I as being beneficially owned by Investments. Mark N. Lampert is the sole shareholder and sole director of BVF Inc., and is an officer of BVF Inc. This joint filing on Form 4 shall not be deemed an admission that Mark N. Lampert is, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities covered by this joint filing. Shares directly beneficially owned by BVF, L.P. Shares directly beneficially owned by BVF2, L.P. Shares directly beneficially owned by Investments. Total amount of shares indirectly beneficially owned by Partners and BVF Inc. BVF Partners L.P., By: BVF Inc., its GP, By: /s/ Mark N. Lampert 2007-11-26 BIOTECHNOLOGY VALUE FUND, L.P. By: BVF Partners L.P., its GP, By: BVF Inc., By: /s/ Mark N. Lampert 2007-11-26 BIOTECHNOLOGY VALUE FUND II, L.P., By: BVF Partners L.P., its GP, By: BVF Inc., By: /s/ Mark N. Lampert 2007-11-26 BVF INVESTMENTS, L.L.C., By: BVF Partners L.P., its Manager, By: BVF Inc., By: /s/ Mark N. Lampert 2007-11-26 BVF INC., By: /s/ Mark N. Lampert 2007-11-26