| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Barclays Global Investors UK Holdings Ltd | 2,886,315 | 4.53 | $6,349,893 | 30-Sep-09 | | PERKINS CAPITAL MANAGEMENT, INC. | 2,791,103 | 4.39 | $6,140,426 | 30-Sep-09 | | VERTICAL GROUP L.P. (THE) | 1,410,710 | 2.22 | $3,103,562 | 30-Sep-09 | | RENAISSANCE TECHNOLOGIES, LLC | 1,333,966 | 2.10 | $2,934,725 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,295,598 | 2.04 | $2,850,315 | 30-Sep-09 | | HAMBRECHT & QUIST CAPITAL MANAGEMENT, INC. | 1,157,112 | 1.82 | $2,545,646 | 30-Sep-09 | | GME Capital LLC | 1,141,197 | 1.79 | $2,510,633 | 30-Sep-09 | | DRIEHAUS CAPITAL MANAGEMENT, INC. | 1,108,333 | 1.74 | $2,438,332 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 942,957 | 1.48 | $2,074,505 | 30-Sep-09 | | STATE STREET CORPORATION | 924,184 | 1.45 | $2,033,204 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | H&Q LIFE SCIENCES INVESTORS | 1,285,000 | 2.02 | $1,310,700 | 31-Mar-09 | | ISHARES RUSSELL 2000 INDEX FD | 929,125 | 1.46 | $2,044,075 | 30-Sep-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 681,786 | 1.07 | $1,022,679 | 30-Jun-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 488,651 | .77 | $1,075,032 | 30-Sep-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 483,117 | .76 | $724,675 | 30-Jun-09 | | DFA U.S. SMALL CAP VALUE SERIES | 441,476 | .69 | $534,185 | 30-Apr-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 307,027 | .48 | $460,540 | 30-Jun-09 | | BRIDGEWAY FDS INC-ULTRA SMALL COMPANY FD | 213,200 | .33 | $319,800 | 30-Jun-09 | | BRIDGEWAY FDS INC-ULTRA SMALL COMPANY MARKET FD | 112,782 | .18 | $169,173 | 30-Jun-09 | | DFA TAX-MANAGED U.S. SMALL CAP PORTFOLIO | 106,977 | .17 | $176,512 | 31-Jul-09 |
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Value shown is computed using the security's price on the report date given.
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