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Related to xanthurenic acid: kynurenic acid, Quinolinic Acid
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The lens pigment 3-hydroxykynurenin is converted to phototoxic xanthurenic acid, and both uveal and retinal melanin is converted from an antioxidant to a pro-oxidant.
Urinary N'-methylnicotinamide is a biochemical test of niacin status and urinary xanthurenic acid excretion following a tryptophan load test is a marker of pyridoxine status (2).