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19. Income taxes (Details 2) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Income Taxes Details |  |
Federal credit at statutory rate | $ (4,846,180) | $ (5,415,468)
State tax, net of Federal benefit | (782,767) | (926,363)
Change in valuation allowance | 5,495,845 | 6,338,928
Other | 133,102 | 2,903
Total provision |  |
Federal credit at statutory rate Percent | 166.75% | 258.71%
State tax, net of Federal benefit Percent | 26.93% | 44.25%
Change in valuation allowance Percent | (189.11%) | (302.82%)
Other Percent | (4.58%) | (0.14%)
Total provision Percent | 0.00% | 0.00%

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