(1)
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execute for and on behalf of the undersigned, in the undersigned’s capacity as an officer and/or director or shareholder of Acceleron Pharma Inc. (the “Company”), Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Act”), and the rules thereunder;
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(2)
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do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4 or 5 and timely file such form with the United States Securities and Exchange Commission and any stock exchange or similar authority; and
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(3)
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take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.
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ADVANCED TECHNOLOGY VENTURES VI, L.P.
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By:
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ATV Associates VI, L.L.C.
Its General Partner
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By:
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/s/ William Wiberg
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Name:
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William Wiberg
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Title:
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Managing Director
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ADVANCED TECHNOLOGY VENTURES VII, L.P.
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By:
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ATV Associates VII, L.L.C.
Its General Partner
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By:
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/s/ Jean George
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Name:
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Jean George
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Title:
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Managing Director
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ADVANCED TECHNOLOGY VENTURES VII(B), L.P.
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By:
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ATV Associates VII, L.L.C.
Its General Partner
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By:
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/s/ Jean George
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Name:
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Jean George
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Title:
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Managing Director
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ADVANCED TECHNOLOGY VENTURES VII(C), L.P.
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By:
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ATV Associates VII, L.L.C.
Its General Partner
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By:
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/s/ Jean George
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Name:
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Jean George
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Title:
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Managing Director
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ATV ENTREPRENEURS VI, L.P.
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By:
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ATV Associates VI, L.L.C.
Its General Partner
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By:
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/s/ William Wiberg
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Name:
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William Wiberg
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Title:
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Managing Director
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ATV ENTREPRENEURS VII, L.P.
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By:
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ATV Associates VII, L.L.C.
Its General Partner
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By:
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/s/ Jean George
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Name:
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Jean George
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Title:
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Managing Director
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ATV ASSOCIATES VI, L.L.C.
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By:
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/s/ William Wiberg
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Name:
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William Wiberg
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Title:
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Managing Director
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ATV ASSOCIATES VII, L.L.C.
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By:
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/s/ Jean George
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Name:
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Jean George
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Title:
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Managing Director
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ATV ALLIANCE 2003, L.P.
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By:
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ATV Alliance Associates, L.L.C.
Its General Partner
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By:
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/s/ Jean George
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Name:
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Jean George
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Title:
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Manager
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