Nat. Immunol. 8, 732–742 (2007); published online 3 June 2007; corrected after print 16 November 2007

In the version of this article initially published, labels in Figures 2 and 4 are incorrect (as is the relevant text for Figure 4), and a reagent is incorrectly identified in Methods. In Figure 2, the label “IfngCNS+54” should be “IfngCNS+55.” For Figure 4, the primers used to analyze the intronic region of Ifng for CpG methylation after bisulfite treatment amplify intron 1; thus, the label above the sixth column in Figure 4a should be “Ifng intron 1” and the accompanying text on page 736, column 1, should read “intron 1” on lines 3 and 13. In the Methods section, page 740 column 2, the end of line 23 should read “rabbit immunoglobulin G.” The errors have been corrected in the PDF version of the article.