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Xanthine Oxidase from bovine milk, Grade I, ammonium sulfate suspension, ≥0.4 units/mg protein
Xanthine Oxidase from bovine milk, lyophilized powder, 0.4-1.0 units/mg protein
Xanthine Oxidase from bovine milk, Grade IV, ammonium sulfate suspension, ≥0.1 units/mg protein
Xanthine Oxidase from bovine milk, Grade III, ammonium sulfate suspension, ≥0.8 units/mg protein