Abstract

A large amount of [3H]GABA was bound to crude synaptic membrane fractions of rat, by sodium-independent process in a medium that contained 100 microM [3H]GABA used for assaying GABA uptake site. This [3H]-GABA binding was different from receptor binding of GABA. It was confirmed that this sodium-independent [3H]GABA binding scarcely occurred in the presence of a physiological concentration of sodium chloride, and that sodium-independent GABA binding had a negligible influence on sodium-dependent GABA binding.

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