Nat. Cell Biol. 13, 568–579 (2011); published online 17 April 2011; corrected after print 21 April 2011

In the version of this article initially published online and in print, Figure 3b was incorrect. The Flag–EndoB1 wild-type label for lane 1 of the gels should have been + instead of −. There was also a missing control panel. These errors has been corrected in both the HTML and PDF versions of the article.