Rod bipolar cells do not express Cx36.A, Double-labeling of a vertical section of rat retina with antibodies against PKC (green) and Cx36 (red). A region of the section with pronounced decoration of rod bipolar terminals with Cx36-positive puncta (arrows) is enlarged in the inset.B, Nomarski image of an isolated rod bipolar cell.C, Corresponding staining against PKC. D, The same cell is not immunoreactive for Cx36. Scale bars:A, 25 μm; inset in A, 10 μm; B–D, 10 μm.