Is it possible that you science guys should consider that this is not a "science" question, but rather a "political" one?
I think it should be considered that--Dew's arguments that heparin is not a biologic notwithstanding--the FDA is looking for some kind of political cover for this approval, a cover that some form of FoB legislation might provide.
It just a thought. As usual I have no idea what I'm talking about.