Stem Cells From Clones: Murder?

In this process, the nucleus from a donor egg is removed and replaced with nucleus from the person who needs stem cells. The egg now having a working nucleus begins to divide and becomes a blastocyst, an undifferentiated sphere of 30 to 150 cells.

At this point the blastocyst is made to stop growing, since further growth would differentiate the cells, and then the cells are cultured so that they will continue to divide, producing more undifferentiated cells.

Anti-abortionists say life begins at conception. This blastocyst was never conceived, because no sperm were involved in its creation. It was never even in a womb. Was it a human? Did it have a soul? Was this blastocyst murdered to benefit the person in need of stem cells?