Any naturally occurring amine functioning as a neurotransmitter or hormone, including dopamine, norepinephrine, and epinephrine. All are derived from tyrosine and have a catechol group (benzene ring with two hydroxyl groups) with an attached amine group. Neurons in the brain, in the adrenal gland, and in some sympathetic nerve fibres produce different catecholamines.
This entry comes from Encyclopædia Britannica Concise.For the full entry on catecholamine, visit Britannica.com.
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