[dpwiener]

I think the more troubling question is whether that removed cell has the capacity to develop into a baby and, if so, they are just creating a twin and killing the twin.

No one has yet been able to take a single removed cell from an embryo and coax it into developing into a baby. But even if they eventually do, so what? What happens when medical science reaches the point where it is capable of taking any human cell and turning into an embryo which can develop into a baby? Does that mean that every cell in our bodies is a potential new human being and that the destruction of even one cell therefore becomes murder?

[Question_Assumptions]

If it requires changing the cell, then it's not a problem. If it doesn't require changing the cell, then it is. That's the short Reader's Digest version.