Nature Neuroscience 9, 1362–1363 (2006); Published online 1 October 2006; corrected after print 23 January 2007

In the version of this article originally published, E.L. Moses-Kolko and S.L. Berga were omitted from the author list. In addition, the affiliation for C.C. Meltzer was incomplete. The correct author list and affiliations, along with a revised author contribution statement, are given below. The errors have been corrected in the HTML and PDF versions of the article.