Nat. Neurosci. 17, 1040–1042 (2014); published online 13 July 2014; corrected after print 4 August 2014

In the version of this article initially published, the e-mail address for author O.T. was given as othoumin@u-bordeaux.fr and a protein in the last paragraph of the main text was given as SVA2. These should be, respectively, olivier.thoumine@u-bordeaux.fr and SV2A. The errors have been corrected in the HTML and PDF versions of the article.