AKR murine leukemia virusLeukemia Virus, MurineMice, Inbred AKRMoloney murine leukemia virusFriend murine leukemia virusLeukemia, ExperimentalAbelson murine leukemia virusRauscher VirusRetroviridaeLeukemia Virus, FelineRetroviridae InfectionsReceptors, VirusMinkVirus ReplicationGenes, ViralLeukemia Virus, BovineCell LineMice, Inbred StrainsHelper VirusesMink Cell Focus-Inducing VirusesDNA, ViralLeukemiaMolecular Sequence DataViral ProteinsViral Envelope ProteinsThymus NeoplasmsLymphomaBase SequenceRNA-Directed DNA PolymeraseTumor Virus InfectionsProvirusesDefective VirusesGammaretrovirusGene Products, gagRNA, ViralRNA VirusesRecombination, GeneticVirus IntegrationSpecies SpecificityVirus Assembly3T3 CellsLeukemia, Myeloid, AcuteVirus CultivationLeukemia Virus, Gibbon ApeGene Products, envGenetic VectorsCell Transformation, Viral