title: Portraits of viruses: the viroid.
mesh_terms: D001483:Base Sequence; D005075:Biological Evolution; D004251:DNA Transposable Elements; D004274:DNA, Recombinant / Q000032:analysis; D009690:Nucleic Acid Conformation; D010935:Plant Diseases; D010944:Plants / Q000382:microbiology; D011328:Prions / Q000302:isolation & purification; D012367:RNA, Viral / Q000235:genetics / Q000302:isolation & purification; D014772:Viroids / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D014779:Virus Replication; D014780:Viruses / Q000145:classification
chemical_list: D004251:DNA Transposable Elements; D004274:DNA, Recombinant; D011328:Prions; D012367:RNA, Viral