| 21-May-09 | Beneficial Owner (10% or more) | 14159 CAPITAL (GP), LLC | Purchase at $6.08 - $6.1 per share. | I | 1,0632 |
| 21-May-09 | Beneficial Owner (10% or more) | BAKER BROTHERS LIFE SCIENCES CAPITAL (GP), LLC | Purchase at $6.08 - $6.1 per share. | I | 38,1202 |
| 21-May-09 | Beneficial Owner (10% or more) | BAKER / TISCH CAPITAL (GP), LLC | Purchase at $6.08 - $6.1 per share. | I | 862 |
| 21-May-09 | Beneficial Owner (10% or more) | BAKER BROS. CAPITAL (GP), LLC | Purchase at $6.08 - $6.1 per share. | I | 242 |
| 19-May-09 | Beneficial Owner (10% or more) | 14159 CAPITAL (GP), LLC | Purchase at $5.98 - $6 per share. | I | 2,2562 |
| 19-May-09 | Beneficial Owner (10% or more) | BAKER BROTHERS LIFE SCIENCES CAPITAL (GP), LLC | Purchase at $5.98 - $6 per share. | I | 80,9912 |
| 19-May-09 | Beneficial Owner (10% or more) | BAKER / TISCH CAPITAL (GP), LLC | Purchase at $5.98 - $6 per share. | I | 1832 |
| 19-May-09 | Beneficial Owner (10% or more) | BAKER BROS. CAPITAL (GP), LLC | Purchase at $5.98 - $6 per share. | I | 522 |
| 18-May-09 | Beneficial Owner (10% or more) | 14159 CAPITAL (GP), LLC | Purchase at $5.84 - $6 per share. | I | 2,4552 |
| 18-May-09 | Beneficial Owner (10% or more) | BAKER BROTHERS LIFE SCIENCES CAPITAL (GP), LLC | Purchase at $5.84 - $6 per share. | I | 88,1212 |
| 18-May-09 | Beneficial Owner (10% or more) | BAKER / TISCH CAPITAL (GP), LLC | Purchase at $5.84 - $6 per share. | I | 1992 |
| 18-May-09 | Beneficial Owner (10% or more) | BAKER BROS. CAPITAL (GP), LLC | Purchase at $5.84 - $6 per share. | I | 562 |
| 13-May-09 | Beneficial Owner (10% or more) | 14159 CAPITAL (GP), LLC | Purchase at $5.45 - $5.46 per share. | I | 12,2792 |
| 13-May-09 | Beneficial Owner (10% or more) | BAKER BROTHERS LIFE SCIENCES CAPITAL (GP), LLC | Purchase at $5.45 - $5.46 per share. | I | 440,6232 |
| 13-May-09 | Beneficial Owner (10% or more) | BAKER / TISCH CAPITAL (GP), LLC | Purchase at $5.45 - $5.46 per share. | I | 9962 |