Biotech claims for safer stem cells

A California biotech announced at the Stem Cell Summit in New York City on Tuesday that they have successfully reprogrammed human skin, kidney, and retina cells to a stem-cell-like state without using potentially cancer-causing retroviruses. But experts say their claims are impossible to evaluate since the work has not been peer-reviewed. The company researchers did not say these new cells produced teratomas -- the sign that cells are truly pluripotent. The company, PrimeGen Biotech based in