Still do, I think. One problem, aside from transplant rejection is the possibility of zoorganisms, or animal diseases, a very real concern. Kat On Fri, 20 Sep 2002 10:56:21 EDT "BG Greer, PhD" <[log in to unmask]> wrote: > In a message dated 9/20/02 5:58:00 AM, > [log in to unmask] writes: > > >You know that pigs are used to study many > human maladies. Ie: alcoholism. > >??? > > > In ways the are very similar to humans. I > believe that they used to use their > heart valves in humans. > > Bobby >