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We're almost in the same boat - I'm waiting on PTSC and I own a small position in PSTI but I haven't made any money in the pennies LOL!
Stem cells will obviously be the next big thing in the biotech/medical world. Let's hope we're in the right company that will take advantage of it. I'll add more if it starts to look promising. Right now, I realize this is quite a long shot and it will take a long time before it proves its' worth.