Nat. Neurosci. 10, 1260–1267 (2007); published online 16 September 2007; corrected after print 23 October 2007

In the version of this article initially published, the filled and open symbols were switched in Figure 3b. A minus sign was also introduced into the text describing the figure. The figure has been corrected, and the sentence in the text beneath the figure should read: “By plotting conductance against voltage35, it can be seen that stargazin induced a +33 mV shift in the voltage for half-maximal block by spermine (Fig. 3b).” The error has been corrected in the HTML and PDF versions of the article.