| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | MORGAN STANLEY | 1,292,704 | 5.28 | $13,521,683 | 30-Sep-09 | | JENNISON ASSOCIATES LLC | 996,800 | 4.07 | $10,426,528 | 30-Sep-09 | | Bank of New York Mellon Corporation | 591,682 | 2.42 | $6,188,993 | 30-Sep-09 | | PERSEUS, L.L.C. | 4,076,169 | 16.64 | $42,636,727 | 30-Sep-09 | | SOROS FUND MANAGEMENT LLC | 4,076,169 | 16.64 | $42,636,727 | 30-Sep-09 | | FMR LLC | 3,414,425 | 13.94 | $35,714,885 | 30-Sep-09 | | BROOKSIDE CAPITAL MANAGEMENT, LLC | 2,999,526 | 12.25 | $31,375,041 | 30-Sep-09 | | DiamondBack Capital Management | 438,046 | 1.79 | $4,581,961 | 30-Sep-09 | | FRANKLIN RESOURCES, INC | 425,000 | 1.74 | $4,445,500 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 386,893 | 1.58 | $4,046,900 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY GROWTH COMPANY FUND | 2,440,914 | 9.96 | $25,531,960 | 30-Sep-09 | | JENNISON SECTOR FDS-JENNISON HEALTH SCIENCES FD | 771,400 | 3.15 | $6,819,176 | 31-Aug-09 | | FIDELITY ADVISOR NEW INSIGHTS FUND | 533,100 | 2.18 | $5,576,226 | 30-Sep-09 | | FRANKLIN STRATEGIC SERIES-FRANKLIN BIOTECHNOLOGY DISCOVE | 195,400 | .80 | $2,043,884 | 30-Sep-09 | | VAN KAMPEN SMALL CAP GROWTH FUND | 154,200 | .63 | $1,884,324 | 30-Jun-09 | | FIDELITY ADVISOR GROWTH OPPORTUNITIES FUND | 134,463 | .55 | $1,406,482 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 132,082 | .54 | $1,381,577 | 30-Sep-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 116,034 | .47 | $1,417,935 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 112,970 | .46 | $1,380,493 | 30-Jun-09 | | TCW SMALL CAP GROWTH FUND | 110,929 | .45 | $1,130,366 | 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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