Nat. Genet. 45, 701–706 (2013); published online 28 April 2013; corrected after print 28 May 2014

In the version of this article initially published, the claim that the ghrelin gene was lost specifically in the two turtle species was incorrect, and ghrelin sequences can be found in the genome sequences originally published. The error has been corrected in the HTML and PDF versions of the article.