A week ago, scientists from Oregon Health and Science University and the Oregon National Primate Research Center announced that they had successfully used human skin cells to clone embryonic stem cells. In the few days since the researchers' work came online, though, the research has been found to contain a few key errors.

An anonymous online commenter on PubPeer, a post-publication peer review discussion site, highlighted four potential issues regarding image reuse in the paper, published online in the journal Cell on May 15. (Unlike in most corners of the Internet, commenting anonymously isn't a mark of trolling on PubPeer, which aims to maintain "the rigor and anonymity of the closed review process currently used by the major journals.")