Nat. Biotechnol. 30, 615–618 (2012); doi:10.1038/nbt.2291; published online 9 July 2012; corrected after print 7 December 2012

In the version of this article initially published, in Table 1 “Patents claiming anti-TNFα antibodies,” patent US 7012135 should have been assigned to UCB Pharma and not UC Berkeley. The error has been corrected in the PDF and HTML versions of this article.