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The study, laid out in two papers published by Nature in January, surprised scientists around the world by finding that a simple acid bath might turn cells in the body into multipurpose stem cells. The new technique could be a quicker and easier source of stem cells than methods now in use, the authors said.
But on Monday, Teruhiko Wakayama, a professor of developmental engineering at the University of Yamanashi and one of the study’s co-authors, told NHK, Japan’s public broadcaster, that a series of concerns raised in recent weeks by researchers around the world had shaken his belief in the study’s findings.
“There are too many overall issues that I am not sure about. I am increasingly uncertain,” Dr. Wakayama told NHK.
The new technique was developed by researchers at the Riken Center for Developmental...