Nature Cell Biol. 12, 80–81 (2010); published online 20 December 2009; corrected after print, 10 March 2010

In the version of this Letter initially published, an author, Claudia Lukas, was omitted. The author list and author's affiliations have been changed to:

Simon Bekker-Jensen1,3,4, Jannie Rendtlew Danielsen1,3,4, Kasper Fugger1, Irina Gromova2, Annika Nerstedt1, Claudia Lukas1, Jiri Bartek1, Jiri Lukas1 & Niels Mailand1,3

This change has been introduced in the html and PDF versions of the paper.