Nat. Med. 22, 1482–1487 (2016); published online 31 October 2016; corrected after print 18 April 2017

In the version of this article initially published, the IA-2545–562 peptide identified as a target of a T cell clone was mislabeled as the native version of the peptide. The T cell clone responded to a modified version of the peptide with glutamine-to-glutamic-acid deaminations at positions 548, 551 and 556. The sentence, “From donor T1D.7, a CD4+ T cell clone recognized an IA-2 peptide with three glutamine-to-glutamic-acid deaminations (IA-2545–562(Q–G548,551,556); Fig. 2e)” has been added on p.1484 to reflect this. The relevant text has also been edited in the main text on p.1483; in Figure 2e and the Figure 2 legend; and in Figure 3b. Additionally, the phrase, ', a deaminated IA-2 peptide' has been added after '...(a panel of 60 peptides)...' to the 'Peptides' section of the Online Methods. Finally, in the Figure 2 legend, the phrase 'Detection of reactivity to known autoreactive targets...' has been changed to 'Detection of reactivity to autoreactive targets...'. These errors have been corrected in the HTML and PDF versions of the article.