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Xanthine oxidase is a molybdenum-containing metalloenzyme that plays a crucial role in purine metabolism by catalyzing the oxidation of xanthine to uric acid. This transformation represents the final step in the degradation of purine nucleotides in humans and higher primates. The enzyme exists as a homodimer, and each subunit contains a molybdenum center, one flavin adenine dinucleotide (FAD), and two iron–sulfur _____ ___ ____ __________ ________ ________ __________ ____.
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