Abstract
Retinal γ-aminobutyric acid (GABA) neurons have been localized immunocytochemically using a new antiserum against rabbit brain glutamate decar☐ylase (GAD). The animals examined were: dogfish, ratfish, goldfish, catfish, turtle, chick, mouse, rat, pig, rabbit, cat and New World monkey. GAD-containing processes, observed as punctate deposits of immunochemical reaction product, formed discrete bands within the inner plexiform layers of all retinas examined. Immunoreactive, and therefore presumably GABAergic, amacrine cells were observed in all species. Displaced GABAergic amacrine cells were observed in the retinas of goldfish, catfish, turtle and chick, and sparsely in the rabbit as well. GABAergic horizontal cells were detected in catfish, goldfish, chick and turtle. Interplexiform cells in the cat and the rat were clearly immunoreactive for glutamate decar☐ylase; this is the first report of GABAergic interplexiform cells in the rat.
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