| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | ORBIMED ADVISORS LLC. | 4,534,000 | 9.36 | $18,226,680 | 30-Sep-09 | | Visium Asset Management | 4,378,563 | 9.04 | $17,601,823 | 30-Sep-09 | | COLUMBIA WANGER ASSET MANAGEMENT, L.P. | 4,013,000 | 8.29 | $16,132,260 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 3,659,138 | 7.56 | $14,709,734 | 30-Sep-09 | | RENAISSANCE TECHNOLOGIES, LLC | 2,980,215 | 6.15 | $11,980,464 | 30-Sep-09 | | GLG Partners, Inc. | 2,460,018 | 5.08 | $9,889,272 | 30-Sep-09 | | MORGAN STANLEY | 2,341,043 | 4.83 | $9,410,992 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,903,233 | 3.93 | $7,650,996 | 30-Sep-09 | | WELLINGTON MANAGEMENT COMPANY, LLP | 1,477,800 | 3.05 | $5,940,756 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 1,299,973 | 2.68 | $5,225,891 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | EATON VANCE WORLDWIDE HEALTH SCIENCES FD | 2,600,000 | 5.37 | $10,452,000 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 699,895 | 1.45 | $2,813,577 | 30-Sep-09 | | COLUMBIA ACORN FD | 669,465 | 1.38 | $3,119,706 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 578,459 | 1.19 | $2,695,618 | 30-Jun-09 | | DFA U.S. SMALL CAP VALUE SERIES | 511,014 | 1.06 | $1,768,108 | 30-Apr-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 451,137 | .93 | $2,102,298 | 30-Jun-09 | | ISHARES NASDAQ BIOTECHNOLOGY INDEX FUND | 389,897 | .81 | $1,235,973 | 31-Oct-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 371,857 | .77 | $1,732,853 | 30-Jun-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 366,315 | .76 | $1,472,586 | 30-Sep-09 | | VANGUARD SMALL-CAP GROWTH INDEX FUND | 365,706 | .76 | $1,704,189 | 30-Jun-09 |
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*
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Value shown is computed using the security's price on the report date given.
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