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Stereoscopic images of Cx36-labeled neuronal gap junctions in inferior olive (A) and retina (B). A, Neuronal gap junction labeled for Cx36 by three 20 nm gold beads. Postsynaptic density (arrow) is a useful marker for identifying neuronal plasma membranes in freeze–fracture replicas (Rash et al., 1997,2000). C, Two Cx36-labeled gap junctions in a nerve terminal in rat retina. Postsynaptic density (arrow) is indicated.
