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Uptodate Reference Title
Tryptophan and serotonin metabolism
Tryptophan and serotonin metabolism
Pathways of tryptophan and serotonin metabolism in the carcinoid tumor cell. Patients with the carcinoid syndrome often have increased levels of 5-hydroxyindoleacetic acid (5-HIAA) excretion in the urine and serotonin in the blood; urinary serotonin excretion is either normal or slightly increased.