Nat. Immunol. 18, 36–44 (2017); published online 21 November 2017; corrected after print 17 April 2017

In the version of this article initially published, the symbols in the key for Figure 5f were identified incorrectly. The correct key is open circle for Vβ8.2(F108Y) and red square for Vβ8.2(WT). The error has been corrected in the HTML and PDF versions of the article.