title: Natural antibodies.
mesh_terms: D000906:Antibodies; D000917:Antibody Formation; D000941:Antigens; D001323:Autoantibodies; D006460:Hemolysin Proteins; D007109:Immunity; D007239:Infections / Q000276:immunology; D007518:Isoantibodies; D007962:Leukocytes / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D009369:Neoplasms / Q000276:immunology; D011414:Properdin
chemical_list: D000906:Antibodies; D000941:Antigens; D001323:Autoantibodies; D006460:Hemolysin Proteins; D007518:Isoantibodies; D011414:Properdin