Nat. Cell Biol. 18, 142–144 (2016); published online 28 January 2016; corrected after print 4 February 2016

In the version of this News and Views article originally published, the author's affiliation should have read “Institute for Integrative Biology of the Cell, Bât. 34, Avenue de la Terrasse, 9198 Gif sur Yvette cedex, France”. This has been corrected in all online versions of the News and Views article.