@ZZetaAlec: Slippery slope. Woot. See the problem with your "potential" argument is that once a embryo is formed, it is growing into a human shaped person. Does it have the potential to be anything but a human? Not unless you read science fiction. So a human embryo is not a potential human, but a growing baby.
Is it Human DNA? Yes.
Could it become a monkey? No. (some parents might think so after the baby is born and climbing on everything....)
The whole argument boils down to when is an embryo a human, and therefore given rights, specifically the right to life? Once you form a new string of DNA from the mother and father seems logical. Before that they are simply parts of yourself, and can be controlled, so you whole slippery slope analogy is invalid.
