Nat. Cell Biol. 13, 529–540 (2011); published online 24 April 2011; corrected after print 18 April 2011
In the version of this article initially published in print, the colouring of the labels for the confocal microscopy image in Figure 1f was incorrect. This error has been corrected in both the HTML and PDF versions of the article.
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Cellular and Molecular Life Sciences (2013)