Multiple conductance states of the acetylcholine receptor channel complex

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Abstract
The acetylcholine-activated channel of vertebrate skeletal muscle, as manifested in cultured, developing cells, is able to adopt more than one conductance state. This paper briefly reviews the evidence for such multiple conductance channels and presents results showing that the amplitude of subconductance states does not depend on agonist size and (or) valence. This seems to rule out the possibility that subconductances occur during partial occlusion of the channel (by agonist molecules) and supports the idea that subconductances represent discrete, allosterically activated channel conformations.

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