title: Hydroxylation of phenylalanine by the hypoxanthine-xanthine oxidase system.
mesh_terms: D000818:Animals; D002417:Cattle; D006900:Hydroxylation; D007042:Hypoxanthines / Q000378:metabolism*; D066298:In Vitro Techniques; D010649:Phenylalanine / Q000378:metabolism*; D014969:Xanthine Oxidase / Q000378:metabolism*
chemical_list: D007042:Hypoxanthines; D010649:Phenylalanine; D014969:Xanthine Oxidase