Friend murine leukemia virusLeukemia Virus, MurineMoloney murine leukemia virusLeukemia, ExperimentalRetroviridae InfectionsAKR murine leukemia virusLeukemia, Erythroblastic, AcuteSpleen Focus-Forming VirusesMink Cell Focus-Inducing VirusesTumor Virus InfectionsViral Envelope ProteinsAbelson murine leukemia virusHelper VirusesRetroviridaeMice, Inbred StrainsRetroviridae Proteins, OncogenicDNA, ViralGenes, ViralGenes, envRauscher VirusLeukemia Virus, FelineCell LineBase SequenceVirus ReplicationMolecular Sequence DataViral InterferenceGene Products, gagGene Products, envLeukemia Virus, BovineCell Transformation, ViralFriendsRepetitive Sequences, Nucleic AcidViral ProteinsAmino Acid SequenceCloning, Molecular3T3 CellsLeukemiaProto-Oncogene Protein c-fli-1Recombination, GeneticMice, Inbred AKRMice, Inbred BALB CRNA-Directed DNA PolymeraseReceptors, VirusSpleenProvirusesGammaretrovirusRNA, ViralTransfectionDefective VirusesLeukemia, Myeloid, AcuteVirus IntegrationLeukemia Virus, Gibbon ApeMinkOncogenesPreleukemiaHuman T-lymphotropic virus 1Sarcoma Viruses, MurineGenetic VectorsErythroblastsVirionVirus AssemblyGlycoproteinsSpecies SpecificityLymphomaRNA VirusesGenes, gagXenotropic murine leukemia virus-related virusAntigens, ViralVirus CultivationLeukemia, Lymphocytic, Chronic, B-CellLeukemia, LymphoidNucleic Acid HybridizationThymus NeoplasmsMurine Acquired Immunodeficiency SyndromeOncogenic VirusesGene Products, taxRibonuclease HRetroviridae ProteinsRadiation Leukemia VirusGenes, polTerminal Repeat SequencesDNA Restriction EnzymesMutationTranscription, GeneticMuridaeGene Expression Regulation, ViralDimethyl SulfoxideCells, CulturedHylobatesCell Transformation, NeoplasticVaccinia virusOncogene Proteins v-ablLeukemia L1210Enzootic Bovine LeukosisEnhancer Elements, GeneticPolymerase Chain ReactionTumor Cells, CulturedLeukemia, Myelogenous, Chronic, BCR-ABL PositiveViral Plaque AssayMice, Inbred C57BL