New questions have arisen over a human stem cell experiment that was hailed as a tremendous advance when it was announced in May.
Hwang Woo Suk, the South Korean researcher whose laboratory performed the experiment, told the journal Science yesterday that he was correcting some of the photographs that appeared as an online supplement to an article reporting a highly efficient recipe for producing human embryos through cloning, and then extracting their stem cells.
His co-author, Gerald P. Schatten of the University of Pittsburgh, said through a spokeswoman that Dr. Hwang had not informed him of the problem and that he had asked the university's Office of Research Integrity to conduct an inquiry.
NY Times
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