Nat. Cell Biol. 16, 208–210 (2014); published online 28 February 2014; corrected after print 14 March 2014

In the version of this News and Views article originally published, the author affiliations were incorrect. The correct affiliations are as follows: Peter Friedl, Katarina Wolf and Mirjam M. Zegers are in the Department of Cell Biology, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands. Peter Friedl is at the David H. Koch Center for Applied Research of Genitourinary Cancers, Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, 77030, USA. This has been corrected in all online versions of this News and Views article.