title: Eastern Regional Research Center Philadelphia, Pennsylvania.
mesh_terms: D000818:Animals; D002250:Carbon Radioisotopes; D008722:Methods; D008892:Milk / Q000201:enzymology; D014969:Xanthine Oxidase / Q000032:analysis*; D014970:Xanthines
chemical_list: D002250:Carbon Radioisotopes; D014970:Xanthines; D014969:Xanthine Oxidase