Nat. Chem. Biol. 10, 286–290 (2014); published online 9 March 2014; corrected after print 7 April 2014

In the version of this article initially published online, the colors of the purple (SH2 mutant + FAK-FRB) and green (SH2 mutant + p130Cas-FRB) curves in Figure 3d were swapped, leading to a mislabeling of the two experimental results. The error has been corrected for the PDF and HTML versions of this article.