In the January 2012 issue, the article entitled “An act of tolerance” (Nat. Med. 18, 12–16, 2012) incorrectly stated that Ray Owen's 1945 experiment showed that twin cattle sharing a common placenta but different fathers had the same set of human leukocyte antigen markers. Human leukocyte antigens had not been discovered yet, and Owen's work showed that the cattle shared red blood cell types instead. The error has been corrected in the HTML and PDF versions of the article.
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The online version of the original article can be found at 10.1038/nm0112-12
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Correction. Nat Med 18, 189 (2012). https://doi.org/10.1038/nm0212-189
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DOI: https://doi.org/10.1038/nm0212-189
