| Individual/Entity | Most Recent Trans. | Shares Owned as of Trans. Date | ARCH VENTURE PARTNERS V LP Beneficial Owner (10% or more) | Purchase 24-Dec-07 | 2,443,591 24-Dec-07 | BIENAIME JEAN JACQUES Director | Sale 20-Nov-09 | 13,621 20-Nov-09 | DITONNO ANTHONY A Officer | Option Exercise 21-Apr-08 | 106,333 21-Apr-08 | FLYNN JAMES E Beneficial Owner (10% or more) | Sale 13-Jul-09 | 537,701
13-Jul-09 | GHIGLIERI STEPHEN F Officer | Acquisition (Non Open Market) 24-Apr-09 | 35,419 24-Apr-09 | MARKELS MICHAEL Officer | Purchase 9-Dec-08 | 15,645 9-Dec-08 | SVLSF IV, LLC Beneficial Owner (10% or more) | Sale 15-Sep-09 | 2,590,921 15-Sep-09 | TOBIAS JEFFREY K Officer | Option Exercise 30-Nov-09 | 6,665 30-Nov-09 |
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