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APUD system

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APUD system
Amine Precursor Uptake & Decarboxylation system A morphologic and functional subgroup of the endocrine system, encompassing the C cells of the thyroid and ultimobranchial body, type I cells of the carotid body and paraganglia, norepinephrine and epinephrine-producing cells of the adrenal medulla, melanoblasts, pineal gland, and posterior pituitary cells: APUD cells take up tryptophan, convert it to 5-HT–serotonin, which is converted to MAO, 5HIAA


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