| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | DEERFIELD MANAGEMENT | 874,194 | 5.12 | $6,801,229 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 535,108 | 3.14 | $4,163,140 | 30-Sep-09 | | PERKINS CAPITAL MANAGEMENT, INC. | 440,900 | 2.58 | $3,430,202 | 30-Sep-09 | | DAFNA Capital Management, LLC | 387,096 | 2.27 | $3,011,606 | 30-Sep-09 | | RAMIUS LLC | 228,064 | 1.34 | $1,774,337 | 30-Sep-09 | | STATE STREET CORPORATION | 194,984 | 1.14 | $1,516,975 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 155,874 | .91 | $1,212,699 | 30-Sep-09 | | TIAA-CREF INVESTMENT MANAGEMENT, LLC | 82,959 | .49 | $645,421 | 30-Sep-09 | | Howe Barnes Capital Management, Inc. | 74,800 | .44 | $581,944 | 30-Sep-09 | | Redmile Group, LLC | 64,516 | .38 | $501,934 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | ISHARES RUSSELL 2000 INDEX FD | 206,920 | 1.21 | $1,609,837 | 30-Sep-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 109,091 | .64 | $848,727 | 30-Sep-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 71,762 | .42 | $541,803 | 30-Jun-09 | | DFA U.S. MICRO CAP SERIES | 36,350 | .21 | $180,659 | 30-Apr-09 | | DFA TAX-MANAGED U.S. SMALL CAP PORTFOLIO | 27,380 | .16 | $245,872 | 31-Jul-09 | | ISHARES Russell Micro Cap (TM) Index Fund | 27,226 | .16 | $211,818 | 30-Sep-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 22,100 | .13 | $166,855 | 30-Jun-09 | | PERRITT EMERGING OPPORTUNITIES FUND | 19,900 | .12 | $154,822 | 30-Sep-09 | | DFA U.S. Core Equity 2 Portfolio | 13,771 | .08 | $68,441 | 30-Apr-09 | | DFA U.S. SMALL CAP SERIES | 12,865 | .08 | $63,939 | 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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