Dramatic retraction adds to questions about stem cell research

Researchers admit mistakes and question whether STAP cells exist

By Tina Hesman Saey, 10:36 AM July 7, 2014

Rising doubts about easy-to-make stem cells have hit a crescendo: The researchers who claimed to have discovered STAP cells have pulled their papers from the journal Nature. The scientists say that mistakes in the work now make them question the existence of such cells. The original publication described making STAP stem cells simply by stressing mature cells with a squeeze or with a brief plunge in acid.

Other scientists worry that the combination of early enthusiasm about the papers quickly ...

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