Nat. Biotechnol. 27, 399–400 (2009); published online 8 May 2009; corrected after print 8 July 2009

In the version of this article initially published, Phenergan is incorrectly mentioned in paragraph 2 as Merck's antinausea drug. Phenergan is made by Wyeth. The original version also states in paragraph 3 that Wyeth is located in Whitehouse Station, New Jersey. The company's correct location is Madison. The errors have been corrected in the HTML and PDF versions of the article.