title: The origins and evolution of viruses.
authors: A
authors: A
authors: Campbell
mesh_terms: D002213:Capsid / Q000235:genetics / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics; D019143:Evolution, Molecular; D022761:Gene Transfer, Horizontal; D005814:Genes, Viral; D012367:RNA, Viral / Q000235:genetics; D014780:Viruses / Q000235:genetics*
chemical_list: D004279:DNA, Viral; D012367:RNA, Viral