<prompt> Cofactor for xanthine oxidase:ZincCopperMolybdenumSelenium  <response>: Cu - required for all Oxidases e.g. Cytochrome c Oxidase Tyrosinase Ascorbic acid Oxidase Amino acid Oxidase Lysyl Oxidase and also for Cytoplasmic SOD Super Oxide Dismutase Two oxidases do not require Cu, instead, they require Molybdenum. These are: Xanthine Oxidase Sulfite Oxidase All Kinases need Mg2BUT Pyruvate Kinase need K Mg2 All Carboxylases and synthetases also need Mg2 Cytoplasmic SOD requires copper WHEREAS Mitochondrial SOD requires ManganeseMn 