Nat. Immunol. 10, 1200–1207 (2009); published online: 4 October; corrected after print 11 November 2009

In the version of this article initially published, the label along the vertical axis of the top row in Figure 6a is incorrect. The correct label should be Ly6G, and the related text in the legend should read “Numbers adjacent to outlined areas indicate Ly6G+CD11b+ cells (top row) or Ly6C+CD11b+ cells (bottom row).” The error has been corrected in the HTML and PDF versions of the article.