‘Action substances’ of peripheral nerve re-visited

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Abstract
Fifty years ago, four ‘action substances’ were described as being ‘liberated’ from peripheral nerve in the course of activity. An attempt has been made to update this information. Confirmatory evidence is available that acetylcholine and thiamine do play a role in the course of activity. However, the question of the relationship in time between their release and the electrical events, and the possible effect on specific ionic gating mechanisms, remains unclarified. The ‘liberation’ of potassium has been found to be a transmembrane K efflux, and the question of the existence of another substance similar to thiamine has not been pursued.

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