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A cholera toxin β subunit–immuonoreative retinal terminal (A) synapses with an unidentified axonal profile (B), which contains numerous synaptic vesicles. This profile in turn synapses on another unidentified dendritic profile (C). This complex interaction suggests that axo-axonal retinal input modulates the response of SCN neurons to light in both a direct and indirect manner. Magnification = × 40,000.
