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Pharmacologically active choline esters in marine gastropods, Ann.
More recently toxins and narcotizing agents have been described from the hypobranchial gland such as serotonin (5-hydroxytryptamine), murexine (urocanylcholine), choline ester and biogenic amines (Erspamer 1946, 1952; Erspamer & Benati 1953, Whittaker 1960, Malaszkiewicz 1967, Huang & Mir 1971, Andrews et al.
Such in vitro formation of choline may account for the higher choline concentrations in serum than in plasma (Table 3) and could be explained by enzymatic cleavage of choline esters.

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