Nat. Biotechnol. 27, 797–799 (2009); published online 9 September 2009; corrected after print 5 February 2010

In the version of this article initially published, two acknowledgments were inadvertently omitted: NCI Alliance of Glycobiologists for Detection of Cancer and Cancer Risk; and Biotechnology and Biological Sciences Research Council. The error has been corrected in the HTML and PDF versions of the article.