Nat. Biotechnol. 25, 1051–1056 (2007); published online 26 August 2007; corrected after print 7 December 2007

In the version of this article initially published, the sentence starting with “The most thermostable 450 P450 chimera” contains an extra “450.” The correct sentence should start as follows “The most thermostable P450 chimera”. The error has been corrected in the HTML and PDF versions of the article.