Nat. Genet. 41, 1295–1302 (2009); published online 8 November 2009; corrected after print 5 February 2010.

In the version of this article initially published, the sentence under Table 1 on p. 1296 should stop after the words “and 430A arrays,” and the words “or >3 if represented on only one array” should be removed. In addition, on p. 1298, the second parenthesis after “Tg(Hoxb7-myrVenus)” is missing. These errors have been corrected in the HTML and PDF versions of the article.