(Cell Stem Cell 15, 471–487; October 2, 2014)Because of a production issue with this paper, the initial version posted on July 24, 2014 was not the final approved version and contained textual errors. It was replaced by the correct version of the article on July 25, 2014.In response to a reader query, the authors would also like to clarify that, although the graphical abstract indicates that reduction of bivalent domains was induced in 5i conditions, the actual experiment involved for this analysis also included a JNK inhibitor and thus used 6i conditions (Figure 7) as indicated in the manuscript text.