Nat. Biotechnol. 33, 1 (2015); published online 9 January 2015; corrected after print 9 January 2015

In the version of this article initially published, the cost of bringing a drug to market was incorrectly stated as $2.3 billion. The correct amount, as per the Tufts study referenced in the article, is $2.56 billion. The error has been corrected in the HTML and PDF versions of the article.