title: Cross protection among four viroids.
mesh_terms: D001483:Base Sequence; D004463:Ecology; D010935:Plant Diseases; D010942:Plant Viruses / Q000254:growth & development / Q000472:pathogenicity*; D010944:Plants / Q000382:microbiology*; D012367:RNA, Viral
chemical_list: D012367:RNA, Viral