Figure 11. RC1 contains novel retinal networks. A: A Viking rendering of γ+ amacrine cell C5303 shows that it is postsynaptic to ON cone bipolar cells at axonal ribbon sites (circles C and D), presynaptic to ON cone bipolar cell C483, and co-stratifies with ON starburst amacrine cell C4890 (scale 20 μm). The circles indicate corresponding transmission electron microscope (TEM) images. B: Axonal ribbons (r) from ON cone BC C180 target AC neurites as the axon bifurcates in mid-inner plexiform layer. C: ON cone BC C177 makes axonal nanoribbon contacts onto γ+ amacrine cell C5303. D: Axonal ribbon synapses from C166 target cell C5303. C166 receives an axonal veto synapse from a yet unidentified amacrine cell (arrow). E: A large γ+ amacrine cell makes an axonal veto synapse onto an OFF cone bipolar cell axon. F: An axonal cistern contact is formed between ON cone bipolar cell C168 onto an amacrine cell process. E denotes glutamate; γ denotes GABA; and question mark denotes unknown. The letter colors match the profiles in the image. The scales for images B-F are 500 nm.