title: Variation in avian retrovirus genomes.
mesh_terms: D001355:Alpharetrovirus / Q000235:genetics* / Q000502:physiology; D001358:Avian Sarcoma Viruses / Q000235:genetics* / Q000502:physiology; D001483:Base Sequence; D005075:Biological Evolution; D002471:Cell Transformation, Neoplastic; D002472:Cell Transformation, Viral; D003588:Cytopathogenic Effect, Viral; D005814:Genes, Viral; D014644:Genetic Variation; D009154:Mutation; D012367:RNA, Viral; D011995:Recombination, Genetic
chemical_list: D012367:RNA, Viral