Nat. Biotechnol. 27, 140–144 (2009); published online 9 February 2009; corrected after print 9 February 2009

In the version of this article published in print, the second affiliation for Arti Rai was inadvertently inserted into the middle of the affiliation for Sapna Kumar. The two affiliations should have read as follows: “Arti Rai is also at Duke University School of Law, Durham, North Carolina 27708, USA; Sapna Kumar is at the Chambers of the Hon. Kenneth Ripple, US Court of Appeals for the Seventh Circuit, Chicago, Illinois 60604, USA;”. The error has been corrected in the HTML and PDF versions of the article.