Nat. Immunol. 13, 272–282 (2012); published online 12 February 2012; corrected after print 4 April 2012

In the version of this article initially published, the designation for DETCs that lack a Vγ5 TCR is incorrect. The correct designation is 'Vγ5'. Also, on page 273, right column, second full paragraph, the designation for reporter mice in the first sentence is incorrect. The correct designation is 'IL-2p8–GFP'. The errors have been corrected in the HTML and PDF versions of the article.