Uh they do come from a fertilized embryo that if placed in a womb would develop into human life.
Just a question medic. If you had Parkinson's would you use embryos fertilized with your sprem(I'm assuming you are a man) to be harvested for embryonic stem cells.
What is the difference between farming stem cells from fertilized embryos from "laboratory created" embryos and reaping them from the womb of a recently pregnant female? It is still a selfish and dangerous dalliance with human life. To me, once the egg is fertilized it is a human being and don't give me that "potential" crap. Bringing in one's personal afflications into a decision that is, to me, a moral one is irrelevant. It's just selfishness, and a crutch to keep science from finding another way. Take the easiest path, try whatever seems like it would work, if it doesn't work, try something else. If engineers operated like that, this world would be in real trouble. There's a very good reason why they call it "practicing" medicine....
For the record, I am not a man, but no I would not. I do not believe in taking innocent life, no matter what the purpose. Medically, there is a big difference between an aborted fetus, and a 4 day old embryo. Ethically, I believe both of them to be innocent life.
I just strongly believe that if we want our opinions to be respected, we should strive to be as credible as possible. This issue is not abortion, it is fetal stem cell research. The stem cells are harvested from embryos which have been created in a laboratory, and are 4 days old. Some have been frozen, and might remain frozen indefinately. Some are created specifically for this process. There is no pregnancy or abortion, but that does not mean this is ok.
Life begins at conception, and therefore these embryos are each an innocent human. They could be implanted, and produce a baby.