"Stem cell hopes distorted by 'arrogance and spin'"
So says a
"leading scientist...who pioneered fertility research in the UK...Embryos showed a remarkable propensity to produce abnormal chromosomes, he said. [Embryonic] stem cells that had differentiated into one kind of tissue had been seen to change back again. If these were transplanted to a patient, they might cause harm."
HT: Amy Welborn