Nature 525, 469–478 (2015); doi:10.1038/nature15515

In this Review, a sentence was added at proof stages and we inadvertently omitted a citation to a study from the laboratory of Jacob Hanna1. This reference citation should have appeared associated with the sentence: “The observation that naive cells tolerate depletion of epigenetic regulators supports the concept of naive pluripotency as a configuration with a reduced requirement for epigenetic repression compared to primed PS cells and somatic cells1.”