| Individual/Entity | Most Recent Trans. | Shares Owned as of Trans. Date | ABERDARE VENTURES II, L.P. Beneficial Owner (10% or more) | Purchase 24-Feb-09 | 1,720,467
24-Feb-09 | BAY CITY CAPITAL LLC Beneficial Owner (10% or more) | Purchase 19-Feb-09 | 4,337,102 19-Feb-09 | EVNIN LUKE Director | Purchase 24-Feb-09 | 5,790,841
24-Feb-09 | GADICKE ANSBERT Beneficial Owner (10% or more) | Purchase 24-Feb-09 | 5,790,841
24-Feb-09 | GOLDFISCHER CARL Director | Purchase 19-Feb-09 | 4,337,102
19-Feb-09 | GRIFFIN BOBBY IVAN Director | Purchase 24-Feb-09 | 329,755 24-Feb-09 | HARRISON DONALD C Director | Purchase 5-Feb-09 | 27,927 5-Feb-09 | HUDSON BAY CAPITAL MANAGEMENT, L.P. Beneficial Owner (10% or more) | Sale 5-Oct-09 | 3,729,965
5-Oct-09 | KLINGENSTEIN PAUL H Director | Purchase 24-Feb-09 | 1,720,467
24-Feb-09 | KNUDSON MARK B Officer | Purchase 24-Feb-09 | 195,421
24-Feb-09 | KOSKINAS ELLEN E Director | Purchase 24-Feb-09 | 2,225,163
24-Feb-09 | LEA GREGORY S Officer | Purchase 24-Feb-09 | 19,495 24-Feb-09 | MPM BIOVENTURES III QP LP Beneficial Owner (10% or more) | Purchase 24-Feb-09 | 5,790,841
24-Feb-09 | TREMMEL JON T Director | Ownership Statement 28-Jan-09 | 6,156 28-Jan-09 |
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