The table below reflects the status of warrants outstanding at December 31, 2013:
| Warrants | Exercise Price | Expiration Date | ||||||||
| December 1, 2009 | 37,216 | $ | 6.86 | December 1, 2019 | ||||||
| December 31, 2009 | 186,077 | $ | 6.86 | December 31, 2019 | ||||||
| February 8, 2011 | 892,858 | $ | 49.70 | February 8, 2016 | ||||||
| February 19, 2013 | 5,114,633 | $ | 5.77 | December 31, 2019 | ||||||
| Total | 6,230,784 | |||||||||