In the above article [Derian CK, Damiano BP, Addo MF, Darrow AL, D'Andrea MR, Nedelman M, Zhang HC, Maryanoff BE, Andrade-Gordon P (2003) J Pharmacol Exp Ther304:855–861], the colorization was distorted in Fig. 6. The correct figure follows. We regret any confusion or inconvenience caused by this error.
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