| UPGRADES & DOWNGRADES HISTORY |
| Date | Research Firm | Action | From | To | | 28-Jul-08 | Argus | Downgrade | Buy | Sell | | 25-Jun-08 | Roth Capital | Downgrade | Buy | Hold | | 1-Mar-07 | Roth Capital | Upgrade | Hold | Buy | | 18-Jan-07 | Roth Capital | Downgrade | Buy | Hold | | 12-Sep-06 | Morgan Stanley | Initiated | | Equal-weight | | 8-Sep-06 | Susquehanna Financial | Initiated | | Positive | | 31-Jul-06 | Roth Capital | Upgrade | Hold | Buy | | 31-May-06 | FTN Midwest | Initiated | | Buy | | 15-Jul-05 | Leerink Swann | Initiated | | Mkt Perform | | 30-Jun-05 | JP Morgan | Downgrade | Overweight | Neutral |
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| Current Month | Last Month | Two Months Ago | Three Months Ago | | Strong Buy | | | | | | Buy | | | | | | Hold | | | | | | Underperform | | | | | | Sell | | | | |
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