Nat. Chem. Biol. 8, 78–85 (2012); published online 20 November 2011; corrected after print 15 June 2012

In the version of this article initially published, the amount of LPA used in behavioral assays was incorrectly stated in the Methods section as 3 μg when it should have read 4.1 μg. Also, the details of preparation of LPA stock solutions were incomplete in the Methods section. The errors have been corrected in the HTML and PDF versions of the article.