Nat. Chem. Biol. 8, 320 (2012); published online 16 March 2012; corrected after print 20 June 2012

In the version of this article initially published, the doi for the article referred to in the highlight entitled “O-GlcNAc in the dark” is incorrect. The correct doi is 10.1101/gad.182378.111. The error has been corrected in the HTML and PDF versions of the article.