Abstract
PATIENTS with the carcinoid syndrome typically show high blood levels of 5-hydroxytryptamine and increased urinary excretion of 5-hydroxyindolyl-3-acetic acid. Variants of the tumour have, however, been described in which the major secretion is 5-hydroxytryptophan1.
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References
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ECCLESTON, D., CRAWFORD, T. & ASHCROFT, G. Tryptamine in the Blood and Urine of a Patient with a Carcinoid Tumour. Nature 197, 502–503 (1963). https://doi.org/10.1038/197502a0
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DOI: https://doi.org/10.1038/197502a0
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