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A flavoprotein functional as an NADH oxidase has NADH peroxidase activity in the presence of free-FAD. The NADH peroxidase activity was observed in cell free extracts from aerobically grown cells in the presence of free FAD. The enzyme that has this NADH peroxidase activity was purified to homogeneity, and had exactly the same properties as the NADH oxidase.
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Niimura et al. (1994) studied this question.
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