title: Radical explanations for old observations.
mesh_terms: D004064:Digestive System / Q000378:metabolism*; D005609:Free Radicals; D006801:Humans; D010100:Oxygen / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000494:pharmacology
chemical_list: D005609:Free Radicals; D013482:Superoxide Dismutase; D010100:Oxygen