| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Barclays Global Investors UK Holdings Ltd | 5,458,101 | 5.76 | $50,159,948 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 3,737,711 | 3.94 | $34,349,564 | 30-Sep-09 | | STATE STREET CORPORATION | 3,695,107 | 3.90 | $33,958,033 | 30-Sep-09 | | SHAW D.E. & CO., INC. | 3,397,393 | 3.59 | $31,222,041 | 30-Sep-09 | | PRICE (T.ROWE) ASSOCIATES INC | 3,114,780 | 3.29 | $28,624,828 | 30-Sep-09 | | Clearbridge Advisors, LLC | 2,791,591 | 2.95 | $25,654,721 | 30-Sep-09 | | GRANAHAN INVESTMENT MANAGEMENT INC. | 2,451,670 | 2.59 | $22,530,847 | 30-Sep-09 | | FMR LLC | 14,169,339 | 14.95 | $130,216,225 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 13,055,928 | 13.78 | $119,983,978 | 30-Sep-09 | | WELLINGTON MANAGEMENT COMPANY, LLP | 11,953,600 | 12.61 | $109,853,584 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | VANGUARD EXPLORER FUND, INC. | 2,105,000 | 2.22 | $21,723,600 | 31-Jul-09 | | LEGG MASON SPECIAL INVESTMENT TRUST, INC. | 2,000,000 | 2.11 | $18,380,000 | 30-Sep-09 | | FEDERATED KAUFMANN FUND | 11,850,860 | 12.51 | $122,300,875 | 31-Jul-09 | | FIDELITY GROWTH COMPANY FUND | 10,182,261 | 10.74 | $93,574,978 | 30-Sep-09 | | FIDELITY SMALL CAP STOCK FUND | 1,806,458 | 1.91 | $18,642,646 | 31-Jul-09 | | SPDR (R) Ser Tr-SPDR (R) S&P (R) Biotech ETF | 1,777,164 | 1.88 | $19,228,914 | 30-Jun-09 | | PRICE (T.ROWE) HEALTH SCIENCES FUND | 1,485,000 | 1.57 | $16,067,700 | 30-Jun-09 | | ISHARES RUSSELL 2000 INDEX FD | 1,388,967 | 1.47 | $12,764,606 | 30-Sep-09 | | VANGUARD SMALL-CAP INDEX FUND | 1,152,747 | 1.22 | $12,472,722 | 30-Jun-09 | | FIDELITY OTC PORTFOLIO | 1,109,941 | 1.17 | $10,200,357 | 30-Sep-09 |
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Value shown is computed using the security's price on the report date given.
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