| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | GRUBER & MCBAINE CAPITAL MANAGEMENT LLC | 1,625,547 | 5.72 | $6,615,976 | 30-Sep-09 | | BAKER BROTHERS ADVISORS, LLC | 838,175 | 2.95 | $3,411,372 | 30-Sep-09 | | ONTARIO TEACHERS' PENSION PLAN BOARD | 767,568 | 2.70 | $3,124,001 | 30-Sep-09 | | MPM Asset Management, LLC | 3,489,443 | 12.27 | $14,202,033 | 30-Sep-09 | | Redmile Group, LLC | 552,302 | 1.94 | $2,247,869 | 30-Sep-09 | | Taurus Asset Management, LLC | 229,500 | .81 | $934,065 | 30-Sep-09 | | COLUMBUS CIRCLE INVESTORS | 194,907 | .69 | $793,271 | 30-Sep-09 | | MILLENNIUM MANAGEMENT LLC | 77,085 | .27 | $313,735 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 53,029 | .19 | $215,828 | 30-Sep-09 | | CHILTON CAPITAL MANAGEMENT, L.P. | 47,100 | .17 | $191,697 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | ISHARES Russell Micro Cap (TM) Index Fund | 28,636 | .10 | $105,953 | 31-Oct-09 | | DFA TAX-MANAGED U.S. SMALL CAP PORTFOLIO | 19,030 | .07 | $47,765 | 31-Jul-09 | | SPARTAN EXTENDED MARKET INDEX FUND | 4,653 | .02 | $17,216 | 31-Oct-09 | | DFA TAX MANAGED U.S. EQUITY SERIES | 1,400 | .00 | $3,514 | 31-Jul-09 | | DFA U.S. SMALL CAP SERIES | 1,199 | .00 | $3,009 | 31-Jul-09 | | John Hancock Trust-Total Stock Market Index Tr | 860 | .00 | $1,892 | 30-Jun-09 | | AQR Funds-AQR Small Cap Momentum Fd | 200 | .00 | $814 | 30-Sep-09 |
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Value shown is computed using the security's price on the report date given.
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