Tovaxin stock has been hovering at or around 5 bucks a share. Just before Tysabri tanked, it was a little over 60 bucks a share.
I don't think Opexa/Pharmafrontiers' stock was ever that high. There have been two reverse splits in the stock. One was a 50:1 split and a more recent one was 10:1. As an example, that meant that if you held 50 shares then after the first split you would have just one. The result of a reverse split on the apparent historical stock price is to amplify it such that it appears much higher than it actually was. The combined effect of the two reverse splits would amplify the apparent historical price by a factor of 500 (take a look at the stock data from 2000). In contrast, the effect of a regular split, e.g., 1:2, is to cut the price in half.