Nat. Cell Biol. 12, 747–757 (2010); published online 18 July 2010; corrected after print, 16 September 2010

In the version of this article initially published online and in print, the cholera toxin in Fig 8d was inadvertently placed outside of the internalised vesicles rather than inside the vesicles. Since the authors used cholera toxin as a tracer for internalised plasma membrane, this error does not affect their model for autophagosome precursor formation. The correct version of this figure is shown to the right. This error has been corrected in both the HTML and PDF versions of the article.