In the above article [Spencer CI, Yuill KH, Borg JJ, Hancox JC, and Kozlowski RZ (2001) J Pharmacol Exp Ther298:1067–1082], Fig. 9 was printed incorrectly due to a printer's error. The corrected figure follows, and the online version of this figure has been corrected. We regret any confusion or inconvenience caused by this error.
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