Viroids may be escaped introns.
D001483:Base Sequence; D004279:DNA, Viral / Q000235:genetics; D005814:Genes, Viral; D009690:Nucleic Acid Conformation; D012367:RNA, Viral / Q000235:genetics; D014772:Viroids / Q000235:genetics*
D004279:DNA, Viral; D012367:RNA, Viral