Retraction: Regulatory factors of induced pluripotency: current status

The article “Regulatory factors of induced pluripotency: current status” (doi: 10.3978/j.issn.2306-9759.2014.07.01) published in Stem Cell Investigation in July 2014 needs to be retracted, as a part of the Figure 4 was adapted from other publication and the authors did not obtain the copyright permission. We deeply apologize for the inconvenience caused.