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Crossover enhances low light sensitivity via AII amacrine cells. OFF bipolar cells provide excitation to the OFF ganglion cell. Rod bipolar cells excite AII amacrine cells via a conventional glutamate synapse. AII amacrine cells convey crossover ON inhibition to the OFF ganglion cell to extend the range of this otherwise cone-driven response to include scotopic sensitivity. This figure is abstracted from Manookin et al. (2008).
