The topic of stem cells is a hot issue due to all the vast potential they have, the ethical debates they entail, and the political party alignments that are associated with. Produced by either cloning via somatic cell nuclear transplant or by in vitro fertilization of human eggs, human stem cells can be acquired from human embryos. But they can also be obtain from adults.

Their value in drug testing and disease models, their lack of rejection, their rapid proliferation, their potential to form every cell type and finally, their great promise are the most often stated advantages of embryonic stem cells.

However, these