Nat. Genet. 43, 66–71 (2011); published online 19 December 2010; corrected after print 22 September 2011

In the version of this article initially published, the percentage reduction of P2RY11 expression in CD8+ T lymphocytes was incorrectly given as 339%, when it should have been 72%. The percentage was not given for NK cells and should have been 70%. The errors have been corrected in the HTML and PDF versions of the article.