e simplicity of the technique, which Obokata and her colleagues dubbed stimulus triggered acquisition of pluripotency, or STAP, caught many experts off-guard.

?So you mistreat cells under the right conditions and they assume a different state of differentiation? It?s remarkable,? said Rudolf Jaenisch, a pioneering stem cell researcher at MIT who was not involved in the study. ?Let?s see whether it works in human cells, and there?s no reason why it shouldn?t.?

Obokata said that researchers had already begun experiments on human cells, but offered no details.