Schematic drawing indicating the wiring of the mammalian retina in the IPL. AII amacrine cells make homotypic gap junctions containing Cx36 with other AII amacrines in the innermost layer of the IPL (depicted as Cx36–Cx36). In addition, heterotypic gap junctions with Cx36 expressed by AII amacrine cells (Cx36-?) are made with cone bipolar cells.C, Cones; R, rods; CB, cone bipolar cells; RB, rod bipolar cells;AII, AII amacrine cells; GC, ganglion cells.