Abstract

AbstractVarious monoamines released as neurohormones from the pericardial organs of crab hearts were found to potentiate the oxygen affinity of haemocyanin from Cancer magister. Of the compounds tested, the catechol dopamine was the most active. Preincubation of the haemocyanin with a dopamine antagonist abolished the effect, indicating a specific site. Haemocyanin may also retard the rapid auto‐oxidation of dopamine that normally occurs at physiological pH.

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