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| Date | Trading Symbol | Open | High | Low | Close | Volume |
| 7/2/2009 | PBIO | 1.5800 | 1.5800 | 1.4500 | 1.4600 | 8200 |
| 7/1/2009 | PBIO | 1.6800 | 1.7600 | 1.5401 | 1.5401 | 6700 |
| 6/30/2009 | PBIO | 1.6300 | 1.6900 | 1.6300 | 1.6800 | 2037 |
| 6/29/2009 | PBIO | 1.6399 | 1.6400 | 1.6399 | 1.6400 | 2500 |
| 6/22/2009 | PBIO | 1.7100 | 1.7100 | 1.6500 | 1.6500 | 4103 |
| 6/16/2009 | PBIO | 1.6200 | 1.7500 | 1.5100 | 1.5900 | 2700 |
| 6/15/2009 | PBIO | 1.5500 | 1.6800 | 1.5500 | 1.6800 | 5362 |
| 6/12/2009 | PBIO | 1.6300 | 1.6400 | 1.5500 | 1.5500 | 9358 |
| 6/11/2009 | PBIO | 1.6000 | 1.6000 | 1.5500 | 1.6000 | 5800 |
| 6/10/2009 | PBIO | 1.5500 | 1.7400 | 1.5500 | 1.5500 | 10858 |
| 6/9/2009 | PBIO | 1.7500 | 1.8000 | 1.6900 | 1.6900 | 45004 |
| 6/8/2009 | PBIO | 1.7600 | 1.8400 | 1.7600 | 1.7800 | 8540 |
| 6/4/2009 | PBIO | 1.8000 | 1.9200 | 1.8000 | 1.8382 | 2795 |
| 6/3/2009 | PBIO | 1.9200 | 1.9201 | 1.7900 | 1.7900 | 3800 |
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