vision/eye
• cone bipolar cells are present in mutants but they are void of glycine, indicating that neurotransmitter coupling between ON bipolar cells and glycinergic AII amacrine cells is disrupted in mutants
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• scotopic electroretinogram recordings in response to 20 msec white light flashes in dark-adapted mutants showed that b-wave amplitudes were smaller than in wild-type controls but a-waves did not differ, indicating a defect in the rod driven circuitry
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