Abstract
Extracts of the hypobranchial gland of the prosobranch marine gastropod Buccinum Undatum (common whelk) has been found to have a very high acetylcholine-like activity (equivalent to about 0.3 μmoles acetylcholine/g tissue) when assayed on the frog rectus abdominis muscle. So far, high hypobranchial acetylcholine equivalences have been known to occur only in the dye-secreting family of prosobranch gastropods, Muricidae, to which Buccinum does not belong. The active principle has been identified as acrylylcholine and is thus related to the two esters which have been isolated previously from Muricidae, urocanylcholine (4(5)-imidazolylacrylylcholine) and β, β-dimethylacrylylcholine.
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