title: An aspect of the origin and evolution of viruses.
mesh_terms: D001435:Bacteriophages; D005075:Biological Evolution; D004279:DNA, Viral; D005827:Genetics, Microbial; D008967:Molecular Biology; D009858:Oncogenic Viruses; D010957:Plasmids; D012367:RNA, Viral; D014780:Viruses
chemical_list: D004279:DNA, Viral; D012367:RNA, Viral