Mouse cells exposed to an acidic environment turned into embryonic-like "STAP" cells. These were used to generate an entire fetus.

A coauthor of a disputed study on a new way generating stem cells through exposure to acid and other stresses has asked for its retraction, it was reported Monday.

Teruhiko Wakayama asked for retraction of two papers describing so-called STAP cells, according to the Yomiuri Shimbun. The papers had been published in the Jan. 30 edition of the journal Nature. Other news outlets, including the Wall Street Journal and the Boston Globe, quickly followed up with the call for retraction.

The original announcement gained worldwide attention because it promised an easy way to generate pluripotent stem cells, which act like embryonic stem cells. Simply immersing cells in an acid bath or squeezing them was enough to reprogram them to the embryonic-like state, the scientists reported. The acronym STAP stands for stimulus-triggered acquisition of pluripotency.

However, researchers attempting to replicate the experiment, including those at the Salk Institute and The Scripps Research Institute in La Jolla, have so far reported failure. And errors in the papers, including duplication of images, have caused scientists to question the findings.

The first author of both papers is Haruko Obokata, 30, of the Riken Center for Developmental Biology in Japan. She was hailed as a scientific prodigy after the research was published. Another coauthor, Charles Vacanti, chairman of the Anesthesiology department at Brigham and Womens Hospital in Boston, had previously said the errors were caused by overwork and didn't affect the results.

As recently as Feb. 27, Wakayama said scientists should give replication efforts a year before passing judgment.

But on Monday, Wakayama said the irregularities render the findings questionable.

"Wakayama said images that show pluripotency of STAP cells look almost identical to those used in Obokatas doctoral thesis about pluripotent stem cells that exist in human body," the Yomiuri Shimbun reported.

Wakayama is probably acting out of a sense of duty, said Jeanne Loring, a stem cell scientist at The Scripps Research Institute.

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STAP cells paper coauthor asks for retraction