In the above article [Ren J, Zaichuan M, Stewart NA, and Jackson E (2009) J Pharmacol Exp Ther 328:855–865], Figs. 1, 2, 3, 4, 5 were of poor resolution in the printed issue. The online versions were not affected. The enhanced figures and their legends appear below.
The printer regrets this error and apologizes for any confusion or inconvenience it may have caused.
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