| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | TCW GROUP, INC. (THE) | 3,087,541 | 6.71 | $24,484,200 | 30-Sep-09 | | FRONTIER CAPITAL MANAGEMENT COMPANY INC | 2,650,968 | 5.76 | $21,022,176 | 30-Sep-09 | | MASSACHUSETTS FINANCIAL SERVICES CO - OTHER | 1,966,179 | 4.27 | $15,591,799 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,863,583 | 4.05 | $14,778,213 | 30-Sep-09 | | LORD ABBETT & CO | 1,853,325 | 4.03 | $14,696,867 | 30-Sep-09 | | Cypress Funds LLC | 1,737,200 | 3.77 | $13,775,996 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,700,767 | 3.69 | $13,487,082 | 30-Sep-09 | | S SQUARED TECHNOLOGY CORP. | 1,571,300 | 3.41 | $12,460,409 | 30-Sep-09 | | SECTORAL ASSET MANAGEMENT, INC. | 1,353,622 | 2.94 | $10,734,222 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 5,126,065 | 11.14 | $40,649,695 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | Manning & Napier Maryland Life Sciences Series Fund | 2,323,200 | 5.05 | $14,380,608 | 30-Jun-09 | | LORD ABBETT DEVELOPING GROWTH FUND | 1,192,509 | 2.59 | $7,703,608 | 31-Jul-09 | | FEDERATED KAUFMANN FUND | 4,916,800 | 10.68 | $31,762,528 | 31-Jul-09 | | MFS NEW DISCOVERY FUND | 835,840 | 1.82 | $6,527,910 | 31-Aug-09 | | MFS VARIABLE INSURANCE TRUST-MFS NEW DISCOVERY SERIES | 701,499 | 1.52 | $4,342,278 | 30-Jun-09 | | ISHARES RUSSELL 2000 INDEX FD | 673,947 | 1.46 | $5,344,399 | 30-Sep-09 | | Pioneer Growth Opportunities Fund | 530,576 | 1.15 | $3,284,265 | 30-Jun-09 | | TCW SMALL CAP GROWTH FUND | 498,386 | 1.08 | $3,219,573 | 31-Jul-09 | | FRANKLIN STRATEGIC SERIES-SMALL CAP GROWTH FUND | 489,300 | 1.06 | $3,880,149 | 30-Sep-09 | | VANGUARD SMALL-CAP INDEX FUND | 473,546 | 1.03 | $2,931,249 | 30-Jun-09 |
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Value shown is computed using the security's price on the report date given.
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