Nature Methods 3, 191–197 (2006); published online 17 February 2006; corrected after print 1 March 2006.

In the version of this article initially published, the name of one of the receptors mentioned in the abstract was incorrectly stated as OY-II instead of OT-II. The correct sentence is: “We demonstrate that these retrogenic mice are comparable to transgenic mice expressing three commonly used TCRs (OT-I, OT-II and AND).”

This error has been corrected in the HTML and PDF versions of the article.