You missed my point, the point is at what point during development does one have a soul, and when they have a soul they're a person from that instant on. That's why abortion is such a sticky issue, balancing the rights of women against the rights of a person whom cannot take care of themselves yet. So the destruction of embryos to harvest stem cells could be argued as murdering people in the name of science.
It's very hard to measure brain wave activity through a mother's womb because you can't put the electrodes on the embryo/fetus directly. So my question is at what point are we past the point of a woman's right to choose, because once the embryo/fetus has a soul I'd say the right to live trumps the right to choose.