Nature 506, 451–455 (2014); doi:10.1038/nature13109

In this Article, author Jared Becksfort’s surname was incorrectly spelled ‘Becksford’. Also, his affiliation should be the Department of Computational Biology and Bioinformatics (not the Department of Pathology) at St Jude Children’s Research Hospital. His name and affiliation have been corrected online.