kynurenine

[ kīn-yurə-nēn′, kĭn-, kī′nyu-rēnĭn, -rĕnĭn, kĭn′yu- ]

n.

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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.