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 LineVirus ReplicationBase SequenceViral InterferenceGene Products, gagMolecular Sequence DataGene Products, envLeukemia Virus, BovineCell Transformation, ViralFriendsRepetitive Sequences, Nucleic AcidViral ProteinsAmino Acid Sequence3T3 CellsLeukemiaCloning, MolecularProto-Oncogene Protein c-fli-1Recombination, GeneticMice, Inbred AKRMice, Inbred BALB CRNA-Directed DNA PolymeraseReceptors, VirusSpleenProvirusesGammaretrovirusRNA, ViralDefective VirusesTransfectionLeukemia, Myeloid, AcuteVirus IntegrationLeukemia Virus, Gibbon ApeMinkOncogenesPreleukemiaHuman T-lymphotropic virus 1Sarcoma Viruses, MurineGenetic VectorsErythroblastsVirionVirus AssemblyGlycoproteinsLymphomaGenes, gagRNA VirusesXenotropic murine leukemia virus-related virusSpecies SpecificityAntigens, ViralVirus CultivationLeukemia, Lymphocytic, Chronic, B-CellLeukemia, LymphoidThymus NeoplasmsMurine Acquired Immunodeficiency SyndromeOncogenic VirusesGene Products, taxNucleic Acid HybridizationRibonuclease HRetroviridae ProteinsRadiation Leukemia VirusGenes, polTerminal Repeat SequencesDNA Restriction EnzymesMuridaeGene Expression Regulation, ViralDimethyl SulfoxideHylobatesTranscription, GeneticCell Transformation, NeoplasticCells, CulturedMutationVaccinia virusOncogene Proteins v-ablLeukemia L1210Enzootic Bovine LeukosisEnhancer Elements, GeneticTumor Cells, CulturedLeukemia, Myelogenous, Chronic, BCR-ABL PositiveViral Plaque Assay