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Summary diagram of synaptic connections between photoreceptor neurons and their first-order interneurons. Small-field projection neurons, Tm5 and Tm9, receive inputs from the chromatic channels, R7 and R8, respectively, as well as from the achromatic channel L3. Wide-field amacrine neuron Dm8 receives input from multiple R7s and is presynaptic to Tm5 and Tm9. In addition, R7 receives direct input from R8.
