uwaahh~~This thread has gone to waste....(-_-;;). But, even now, with nuclear transplant procedures, scientists don't have to work with what could be considered "living human beings". Rather, a nucleus from, say, a skin cell, is injected into a donor cell without a nucleus. Thus, when researchers test embryonic stem cells, they are not testing on "potential humans". Also, germline cells provide so much more oppportunities than adult stem cells because they possess pluripotency, the ability to develop into any type of cell. They can also be cultured into infinite stem cell lines whereas adult stem cells appear only when the body is severely injured or under extreme stress. It's a waste of human life, if rejected eggs from abortion clinics are just poured down the drain despite the fact that they could be used to advance medicinal science. Plus, through experience with embryonic stem cells, we can better define the borderline between bioethics and simply using science for vanity(such as producing "designer babies"). Because germline therapy affects a person genetically, couples with genetic diseases are now given a rare opportunity to have a child of their own without fears of passing on a disease. Doesn't the future potential far outweigh the risks? whew ah haha, looks like I went on rambling. I'm sorry about that.