| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | GAGNON SECURITIES, LLC | 2,750,466 | 7.10 | $10,864,340 | 30-Sep-09 | | PERKINS CAPITAL MANAGEMENT, INC. | 1,030,196 | 2.66 | $4,069,274 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 983,650 | 2.54 | $3,885,417 | 30-Sep-09 | | JENNISON ASSOCIATES LLC | 777,850 | 2.01 | $3,072,507 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 468,341 | 1.21 | $1,849,946 | 30-Sep-09 | | STRAUS CAPITAL MANAGEMENT LLC | 465,743 | 1.20 | $1,839,684 | 30-Sep-09 | | STATE STREET CORPORATION | 427,932 | 1.10 | $1,690,331 | 30-Sep-09 | | NORTHERN TRUST CORPORATION | 299,213 | .77 | $1,080,158 | 30-Jun-09 | | RENAISSANCE TECHNOLOGIES, LLC | 258,005 | .67 | $1,019,119 | 30-Sep-09 | | PRINCETON CAPITAL MANAGEMENT | 238,700 | .62 | $942,865 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | JENNISON SECTOR FDS-JENNISON HEALTH SCIENCES FD | 655,000 | 1.69 | $1,984,650 | 31-Aug-09 | | ISHARES RUSSELL 2000 INDEX FD | 421,401 | 1.09 | $1,664,533 | 30-Sep-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 209,869 | .54 | $828,982 | 30-Sep-09 | | DFA U.S. MICRO CAP SERIES | 144,413 | .37 | $258,499 | 30-Apr-09 | | PACIFIC SELECT FUND-HEALTH SCIENCES PORTFOLIO | 122,850 | .32 | $443,488 | 30-Jun-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 121,633 | .31 | $439,095 | 30-Jun-09 | | BRIDGEWAY FDS INC-ULTRA SMALL COMPANY MARKET FD | 96,200 | .25 | $347,282 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 84,793 | .22 | $306,102 | 30-Jun-09 | | DFA TAX-MANAGED U.S. SMALL CAP PORTFOLIO | 67,500 | .17 | $222,750 | 31-Jul-09 | | DFA U.S. SMALL CAP SERIES | 55,237 | .14 | $98,874 | 30-Apr-09 |
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Value shown is computed using the security's price on the report date given.
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