title: The immune system: a practitioner's overview.
mesh_terms: D000818:Animals; D000941:Antigens / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D003165:Complement System Proteins / Q000276:immunology; D007109:Immunity; D007110:Immunity, Active; D007111:Immunity, Cellular; D007113:Immunity, Innate; D007136:Immunoglobulins / Q000145:classification / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000941:Antigens; D007136:Immunoglobulins; D003165:Complement System Proteins