title: Evolution of retroviruses from cellular movable genetic elements.
mesh_terms: D001355:Alpharetrovirus / Q000235:genetics; D001483:Base Sequence; D005075:Biological Evolution; D002472:Cell Transformation, Viral; D003001:Cloning, Molecular; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000235:genetics; D004279:DNA, Viral / Q000235:genetics*; D011995:Recombination, Genetic; D012190:Retroviridae / Q000235:genetics*
chemical_list: D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D004279:DNA, Viral