Nat. Biotechnol. 27, 9–10 (2009); published online 8 January 2009; corrected after print 9 February 2009

In the version of this article initially published, in column 3, line 3 in the last paragraph, Debdatta Sengupta was referred to as “he.” The text should have read “she” as Sengupta is a woman. The error has been corrected in the HTML and PDF versions of the article.