Nat. Med. 12, 961–966 (2006); published online 30 July 2006; corrected after print 17 August 2006

In the version of this article initially published, the middle panel of Figure 4d incorrectly reported the percentage of demyelination in M. leprae–treated cultures. The percentage should be 67 ± 3.1 instead of 7 ± 3.1. The error has been corrected in the HTML and PDF versions of the article.