Nat. Immunol. 9, 1347–1355 (2008); published online 9 November 2008; corrected after print 9 April 2009

In the version of this article initially published, graph axes are mislabeled in Figures 1e, 2d and 2e, and a gene symbol is misidentified in the legend to Figure 2. The correct axis labels should be as follows: Figure 1e, middle right and far right vertical axes should end “(relative × 103)”; Figure 2d,e, left vertical axes should read “Il9 mRNA (relative × 102)”; Figure 2e, right vertical axis should read “Il10 mRNA (relative)”; and Figure 2e, horizontal axes should read “WT” (in place of “Foxp3-GFP”) and “GATA3-KO” (in place of “STAT6-KO.Fox3-GFP”). The legend for Figure 2d should state “relative to Hprt1 mRNA” and the legend to Figure 2e should have that phrase removed. The errors have been corrected in the HTML and PDF versions of the article.