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kynurenine

(kīn-yurə-nēn′, kĭn-, kī′nyu-rēnĭn, -rĕnĭn, kĭn′yu-)
n.
  1. An amino acid that is a precursor of kynurenic acid and that is excreted in small amounts in the urine as a product of the metabolism of tryptophan.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.