Nat. Cell Biol. 13, 1224–1233 (2011); published online 18 September 2011; corrected after print 27 September 2011

In the version of this article initially published online and in print, the affiliation denoted by number 4 was incorrect. The correct affiliation is:

4Department of Neuroscience and Imaging, and Ce.S.I. Aging Research Center, Università G.D'Annunzio of Chieti-Pescara, I-66013 Chieti, Italy.

This error has been corrected online in both the HTML and PDF versions of the article.