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Schematic drawing of the alternative pathway for rod signals through the rodent retina. The OFF-pathway is shaded. Rod photoreceptors (R) bypass the rod bipolar cell (RB) and directly excite OFF-cone bipolar cells (CB). The signals are mediated by the AMPA glutamate receptor subunits GluR1 and GluR2 expressed postsynaptically on the dendrites of the OFF-cone bipolar cells. A, amacrine cell; G, ganglion cell.
