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Abstract
Both double-label and intracellular electrophysiological recording techniques were utilized to investigate the interactions between enkephalin and γ-aminobutyric acid in the larval tiger salamander retina.Double-label studies revealed that the vast majority ( 96%) 96%) of enkephalin-immunostained amacrine cells also exhibit high affinity uptake of [ 3H]γ-aminobutyric acid. Electrophysiological evidence demonstrated that morphine and γ-aminobutyric acid exert opposite effects on a population of On-Off ganglion cells. γ-Aminobutyric acid decreased the activity of these cells, while enkephalin increased their activity. These findings support the idea that opiate-mediated pathways inhibit GABAergic pathways in the vertebrate retina.
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