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Whereas the selectivity of other direction-selective RGCs depends on input from starburst amacrine cells, which themselves show directional responses, J-RGCs receive little input from these cells and thus must rely on other mechanisms. One possible mechanism is suggested by the finding that inhibitory synapses on some RGCs are concentrated at distal dendrites. Distal inhibition on the asymmetric dendrites of J-RGCs could account for their asymmetrically displaced surround.[1]
  1. Cite error: Invalid <ref> tag; no text was provided for refs named kim2008