Nat. Med. 17, 573–580 (2011); published online 17 April 2011; corrected after print 4 August 2011

In the version of this article initially published, the authors made several inadvertent errors during manuscript preparation. In Figure 3f the trace for WT mice was incorrect, and in Figure 4a the bands shown for 'Total GR' were incorrect. These errors did not affect the quantification of band intensities shown in Figure 4a and did not affect any of the conclusions of the article. The errors have been corrected in the HTML and PDF versions of the article.