Nat. Immunol. 14, 1155–1165 (2013); published online 22 September 2013; corrected after print 8 January 2014

In the version of this article initially published, the scale of the top row (Naive) for S1pr1 in Figure 5d is incorrect. With the correct scale, S1pr1 expression in naive CD8+ T cells is accurately presented as very high. The error has been corrected in the HTML and PDF versions of the article.