| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | PRICE (T.ROWE) ASSOCIATES INC | 4,187,273 | 9.38 | $44,426,966 | 30-Sep-09 | | Visium Asset Management | 2,602,655 | 5.83 | $27,614,169 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 2,130,247 | 4.77 | $22,601,920 | 30-Sep-09 | | SECTORAL ASSET MANAGEMENT, INC. | 1,776,433 | 3.98 | $18,847,954 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 1,381,457 | 3.10 | $14,657,258 | 30-Sep-09 | | MORGAN STANLEY | 1,322,482 | 2.96 | $14,031,534 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,319,775 | 2.96 | $14,002,812 | 30-Sep-09 | | PALO ALTO INVESTORS, LLC | 1,084,031 | 2.43 | $11,501,568 | 30-Sep-09 | | Pictet Asset Management Ltd | 815,729 | 1.83 | $8,654,884 | 30-Sep-09 | | NOMURA ASSET MANAGEMENT COMPANY LIMITED | 815,729 | 1.83 | $8,654,884 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FEDERATED KAUFMANN FUND | 2,339,242 | 5.24 | $25,380,775 | 31-Jul-09 | | PRICE (T.ROWE) NEW HORIZONS FUND | 1,555,000 | 3.48 | $16,498,550 | 30-Sep-09 | | PRICE (T.ROWE) SMALL-CAP VALUE FUND | 927,400 | 2.08 | $9,839,714 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 516,996 | 1.16 | $5,485,327 | 30-Sep-09 | | ISHARES NASDAQ BIOTECHNOLOGY INDEX FUND | 406,827 | .91 | $3,710,262 | 31-Oct-09 | | FIDELITY SELECT PORTFOLIOS - BIOTECHNOLOGY | 403,340 | .90 | $4,279,437 | 30-Sep-09 | | VANGUARD SMALL-CAP INDEX FUND | 362,850 | .81 | $4,365,085 | 30-Jun-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 270,614 | .61 | $2,871,214 | 30-Sep-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 260,473 | .58 | $3,133,490 | 30-Jun-09 | | DFA U.S. MICRO CAP SERIES | 253,493 | .57 | $2,839,121 | 30-Apr-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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