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Immunohistochemical localization of CB1 receptor in rat retina with preabsorption controls. Fluorescent images of rat retina (a) with control section showing CB1 labeling in the OPL. In the rat, as in all species examined, omission of CB1 antibody, or preabsorption with immunizing protein (b) blocked labeling. Both images were recorded at the same settings with a confocal microscope. (Scale bar = 10 microns.)
