We have developed this most recent protocol to address concerns that to date, to our knowledge, other groups have been able to generate STAP cells using our previously published or posted protocols. While we are confident that the original protocols published, will work if performed with meticulous attention to detail, we have tried to develop a protocol based on new information, that should be much more effective in demonstrating a phenomenon in which we have absolute confidence.
http://www.ipscell.com/2014/09/harvard-stap-cell-authors-release-new-protocol-affirm-belief-in-phenomenon/