Nat. Methods 5, 374–375 (2008); corrected after print 29 May 2008.

In the version of this correspondence initially published, the two previously published datasets analyzed were labeled with incorrect references in Figure 1b. Reference 2 should be associated with the second column (80 sites), and reference 3 should be associated with the third column (96 sites).

The weblink for the Zinc Finger Consortium website was incorrect and should be http://www.zincfingers.org/.

The errors have been corrected in the HTML and PDF versions of the article.