Nat. Struct. Mol. Biol. 18, 1281–1289 (2011); published online 30 October 2011; corrected after print 20 December 2011
In the version of this article initially published, the name of the second author was misspelled. The error has been corrected in the HTML and PDF versions of the article.
The online version of the original article can be found at 10.1038/nsmb.2160
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Immunological Reviews (2019)