"And the only way to turn stem cells into fetal tissue is through implantation in the womb, Smith notes." Uh, science is already way ahead of this level. At Harvard they are already implanting alive embryos into extra-corporeal uterine tissue; the Japanese are able to keep a goat fetus alive for seventeen weeks in their artifical womb.
Scary stuff!
IMO, a soul is a result of God. If I am right and down the road they perfect this ... it will give new meaning when someone says, "that person has no soul". When they do say this about a person, it's one evil person.