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1. Rat liver xanthine oxidase type D (NAD(+)-dependent) and chick liver xanthine oxidase are inhibited by NADH, which competes with NAD(+). 2. The addition of a NADH-reoxidizing system in the assay of these enzyme activities is proposed. 3. Rat liver xanthine oxidase type O (oxygen-dependent) is not affected by NADH.

biochemical journal. cellular aspects

The regulation of xanthine oxidase. Inhibition by reduced nicotinamide–adenine dinucleotide of rat liver xanthine oxidase type D and of chick liver xanthine dehydrogenase