Fig. 9.

DAC synaptic wiring diagram. In the proposed schematic DACs receive excitatory glutamatergic input from ON cone bipolar cells, as well as from intrinsically photosensitive retinal ganglion cells (ipRGCs) in a subset (∼15%) of DACs. In addition, DACs received inhibitory input from 2 sources: one is an unidentified glycinergic amacrine cell (AC) that is driven by excitatory input from rod bipolar cells, and the other is an unidentified GABAergic AC that is driven by excitatory input from OFF cone bipolar cells. Red and green terminals represent ionotropic (AMPA/kainate) and metabotropic (mGluR) glutamatergic synapses, respectively.