Nat. Med. 23, 540–547 (2017); published online 5 May 2017; corrected after print 5 May 2017
In the version of this article published in print, Jeffrey A Bluestone was missing an affiliation. His affiliation information has been changed to include the Parker Institute for Cancer Immunotherapy in San Francisco, California. Accordingly, the affiliation information for Carl H June has been updated to distinguish the Parker Institute from the University of Pennsylvania; these are now two separate affiliations. All affiliation numbers have been revised. The error did not appear in the HTML and PDF versions of the article.