Why does one human life, existing already, matter more or less than one that has yet to come into being? You call it appalling to value the fetus... I call it appalling to do anything ELSE... and thus, the debate on life continues. But that's for a different thread. This one's about the stem cells, themselves... not the other stuff.
And adult stem cells usually CAN'T turn into anything else. Not with our technology. The ones that make it through the body's process of turning them into normal cells, usually cannot transform at all. And the rest are probably not the pick of the primordial litter, either. Which is why they're such a pain in the backside to work with.
