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catecholamine A dihydroxyphenylalkylamine derivative of the amino acid tyrosine: adrenalin and noradrenalin are two such derivatives. Many catecholamines act as neurotransmitters.

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catecholamine Any of a class of amines that possess a catechol (C6H4(OH)2) ring. Including dopamine, adrenaline, and noradrenaline, they function as neurotransmitters and/or hormones.

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