Correction to: British Journal of Pharmacology (2007) 153, 420–431; doi:10.1038/sj.bjp.0707445
Since the above publication, the author has noticed an error in Figure 1. The X axis scale has right-shifted from the dotted line, and the ‘100' mark does not align with the dotted vertical line that indicates the control percentage of binding (which should be at 100). This is confusing, as it prevents one from identifying the control level.
Figure 1.
Please see the correct Figure 1 now shown below.

