| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | BAKER BROTHERS ADVISORS, LLC | 4,579,518 | 9.71 | $156,665,310 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 3,988,933 | 8.46 | $136,461,397 | 30-Sep-09 | | WELLINGTON MANAGEMENT COMPANY, LLP | 3,094,448 | 6.56 | $105,861,066 | 30-Sep-09 | | SECTORAL ASSET MANAGEMENT, INC. | 3,089,301 | 6.55 | $105,684,987 | 30-Sep-09 | | ALGER (FRED) MANAGEMENT INC | 2,780,463 | 5.90 | $95,119,639 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 2,452,826 | 5.20 | $83,911,177 | 30-Sep-09 | | PALO ALTO INVESTORS, LLC | 2,092,161 | 4.44 | $71,572,827 | 30-Sep-09 | | MILLENNIUM MANAGEMENT LLC | 1,871,783 | 3.97 | $64,033,696 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,820,294 | 3.86 | $62,272,257 | 30-Sep-09 | | FMR LLC | 6,814,073 | 14.45 | $233,109,437 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY GROWTH COMPANY FUND | 4,577,511 | 9.71 | $156,596,651 | 30-Sep-09 | | FEDERATED KAUFMANN FUND | 3,500,000 | 7.42 | $108,255,000 | 31-Jul-09 | | COLUMBIA ACORN FD | 1,660,000 | 3.52 | $52,090,800 | 30-Jun-09 | | FIDELITY SELECT PORTFOLIOS - BIOTECHNOLOGY | 1,083,104 | 2.30 | $37,052,987 | 30-Sep-09 | | FIDELITY PURITAN FUND INC | 944,100 | 2.00 | $32,297,661 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 627,370 | 1.33 | $21,462,327 | 30-Sep-09 | | HARTFORD GROWTH OPPORTUNITIES FUND | 553,900 | 1.17 | $17,132,127 | 31-Jul-09 | | ANCHOR SERIES TRUST-CAPITAL APPRECIATION PORTFOLIO | 524,700 | 1.11 | $16,465,086 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 518,150 | 1.10 | $16,259,547 | 30-Jun-09 | | FEDERATED KAUFMANN SMALL CAP FUND | 475,000 | 1.01 | $14,691,750 | 31-Jul-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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