| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | QVT Financial LP | 3,939,844 | 4.30 | $28,012,290 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 3,252,060 | 3.55 | $23,122,146 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 3,244,668 | 3.54 | $23,069,589 | 30-Sep-09 | | DEERFIELD MANAGEMENT | 2,593,567 | 2.83 | $18,440,261 | 30-Sep-09 | | BAKER BROTHERS ADVISORS, LLC | 1,969,512 | 2.15 | $14,003,230 | 30-Sep-09 | | JP MORGAN CHASE & COMPANY | 1,529,996 | 1.67 | $10,878,271 | 30-Sep-09 | | STATE STREET CORPORATION | 1,272,927 | 1.39 | $9,050,510 | 30-Sep-09 | | Copper Rock Capital Partners LLC | 1,152,719 | 1.26 | $8,195,832 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 1,059,188 | 1.16 | $7,530,826 | 30-Sep-09 | | RS Investment Management Co., LLC | 1,003,315 | 1.09 | $7,133,569 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | VANGUARD SMALL-CAP INDEX FUND | 1,037,441 | 1.13 | $7,241,338 | 30-Jun-09 | | ISHARES RUSSELL 2000 INDEX FD | 903,579 | .99 | $5,475,688 | 31-Oct-09 | | ISHARES NASDAQ BIOTECHNOLOGY INDEX FUND | 790,673 | .86 | $4,791,478 | 31-Oct-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 782,543 | .85 | $5,462,150 | 30-Jun-09 | | VANGUARD SMALL-CAP GROWTH INDEX FUND | 655,306 | .72 | $4,574,035 | 30-Jun-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 509,388 | .56 | $3,086,891 | 31-Oct-09 | | JP MORGAN SMALL CAP GROWTH FUND | 496,600 | .54 | $3,009,396 | 31-Oct-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 463,807 | .51 | $3,237,372 | 30-Jun-09 | | RS Investment Trust-RS Small Cap Growth Fund | 418,521 | .46 | $2,975,684 | 30-Sep-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 384,017 | .42 | $2,680,438 | 30-Jun-09 |
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Value shown is computed using the security's price on the report date given.
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