Nat. Biotechnol. 31, 294–296 (2013); doi:10.1038/nbt.2522; published online 5 April 2013; corrected after print 27 June 2013

In the version of this article initially published, the email address for D.H. should have been dharmsen@uni-muenster.de, not dahrmsen@uni-muenster.de. In addition, the sentence on page 295, “Unfortunately, the authors did not supply a repository with raw sequence data along with all applied software parameters and scripts” has been corrected to read “Unfortunately, the authors did not supply a repository with all applied software parameters and scripts, as this is not currently a requirement for publication.” These errors have been corrected in the HTML and PDF versions of the article.