Abstract
3H-Isoguvacine, a gamma aminobutyric acid (GABA) agonist, has been shown to bind to a mouse forebrain synaptic membrane preparation. The specific binding is displaceable by GABA, muscimol and bicuculline but not by picrotoxin or diaminobutyric acid. Kinetic data suggest two binding affinities. Highest levels of binding are observed in the cerebellum, cortex and hippocampus. It is suggested that isoguvacine binds to GABA binding sites and therefore represents a new ligand for measuring GABA receptor binding.
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