| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | ZESIGER CAPITAL GROUP LLC | 2,473,912 | 7.44 | $5,566,302 | 30-Sep-09 | | WASATCH ADVISORS INC | 2,058,591 | 6.19 | $4,631,829 | 30-Sep-09 | | ORBIMED ADVISORS LLC. | 1,670,000 | 5.02 | $3,757,500 | 30-Sep-09 | | HOWARD HUGHES MEDICAL INSTITUTE | 1,489,147 | 4.48 | $3,350,580 | 30-Sep-09 | | PRICE (T.ROWE) ASSOCIATES INC | 1,397,200 | 4.20 | $3,143,700 | 30-Sep-09 | | CONUS PARTNERS INC | 884,311 | 2.66 | $1,989,699 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 510,612 | 1.54 | $1,148,877 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 469,225 | 1.41 | $1,055,756 | 30-Sep-09 | | ADAGE CAPITAL PARTNERS GP, L.L.C. | 425,900 | 1.28 | $958,275 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 355,255 | 1.07 | $799,323 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | PRICE (T.ROWE) NEW HORIZONS FUND | 777,500 | 2.34 | $1,749,375 | 30-Sep-09 | | WASATCH SMALL CAP GROWTH FUND | 656,923 | 1.98 | $1,556,907 | 30-Jun-09 | | ISHARES NASDAQ BIOTECHNOLOGY INDEX FUND | 290,393 | .87 | $621,441 | 31-Oct-09 | | PRICE (T.ROWE) HEALTH SCIENCES FUND | 289,300 | .87 | $685,641 | 30-Jun-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 285,876 | .86 | $677,526 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 160,135 | .48 | $379,519 | 30-Jun-09 | | FIDELITY SELECT PORTFOLIOS - BIOTECHNOLOGY | 153,744 | .46 | $345,924 | 30-Sep-09 | | DFA U.S. MICRO CAP SERIES | 107,479 | .32 | $178,415 | 30-Apr-09 | | COLLEGE RETIREMENT EQUITIES FUND-SOCIAL CHOICE ACCOUNT | 91,661 | .28 | $217,236 | 30-Jun-09 | | PRINCIPAL SMALL CAP GROWTH FD | 71,658 | .22 | $169,829 | 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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