Abstract

Intracellular recordings were made from identified central neurones of the snail Helix aspersa. The antagonism of acetylcholine excitatory and inhibitory responses by d-tubocurarine, HS818 and HS626 was investigated. d-Tubocurarine was equipotent against both the inhibitory and excitatory responses, while HS626 and HS818 were of similar potency to d-tubocurarine in antagonising acetylcholine excitation but were approximately one order of magnitude less potent in antagonising the inhibitory response.

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