Nat. Cell Biol. 14, 979–981 (2012); published online 3 October 2012; corrected online 23 December 2014

We wish to alert readers to the fact that the Letter (S. G. Fonseca et al. Nat. Cell Biol. 14, 1105–1112; 2012) on which this News & Views was based, has been retracted. The comments in this News and Views that rely on the accuracy and reproducibility of this data should therefore be reconsidered.