hide captionThe heart beats in a mouse embryo grown with stem cells made from blood. Now the research that claimed a simple acid solution could be used to create those cells has been retracted.

The heart beats in a mouse embryo grown with stem cells made from blood. Now the research that claimed a simple acid solution could be used to create those cells has been retracted.

A prestigious scientific journal Wednesday took the unusual step of retracting some high-profile research that had generated international excitement about stem cell research.

The British scientific journal Nature retracted two papers published in January by scientists at the Riken research institute in Japan and at Harvard Medical School that claimed that they could create stem cells simply by dipping skin and blood cells into acid.

The claim raised the possibility of being able to use the cells to easily make any kind of cell in the body to treat many diseases and generated international media coverage, including some on Shots.

But other scientists almost immediately raised questions about the papers, and investigators eventually found that the research papers contained many errors. In April, Riken even concluded that Haruko Obokata, the main Japanese scientist, was guilty of scientific misconduct.

The scientists involved in the work, including Charles Vacanti at the Harvard-affiliated Brigham and Women's Hospital in Boston, issued statements regretting the problems with the papers and agreeing that they should be retracted.

"I am deeply saddened by all that has transpired, and after thoughtful consideration of the errors presented in the Riken report and other concerns that have been raised, I have agreed to retract the papers," Vacanti wrote in a statement.

But Vacanti and Obokata said they still believed their techniques could work. In fact, Riken recently agreed to allow Obokata to participate in an experiment aimed at attempting to reproduce the original results.

For its part, the journal Nature said it was reviewing its policies to try to prevent future flawed papers from being published and published retractions of the two original papers as well as the editorial that accompanied them.

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