Nat. Biotechnol. 31, 1015–1022 (2013); doi:10.1038/nbt.2702; published online 15 September 2013; corrected after print 8 November 2013

In the version of this article initially published, in the list of members of the GEUVADIS consortium, Stylianos E Antonorakis should have been Stylianos E Antonarakis. The error has been corrected in the HTML and PDF versions of the article.