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 Sequence3T3 CellsCloning, MolecularLeukemiaProto-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 AssemblyGlycoproteinsLymphomaSpecies SpecificityRNA VirusesGenes, gagXenotropic murine leukemia virus-related virusAntigens, ViralVirus CultivationLeukemia, Lymphocytic, Chronic, B-CellLeukemia, LymphoidThymus NeoplasmsNucleic Acid HybridizationMurine Acquired Immunodeficiency SyndromeOncogenic VirusesGene Products, taxRibonuclease HRetroviridae ProteinsRadiation Leukemia VirusGenes, polTerminal Repeat SequencesDNA Restriction EnzymesTranscription, GeneticMuridaeGene Expression Regulation, ViralDimethyl SulfoxideMutationHylobatesCells, CulturedCell Transformation, NeoplasticDrug DiscoveryVaccinia virusOncogene Proteins v-ablLeukemia L1210Enhancer Elements, GeneticEnzootic Bovine LeukosisTumor Cells, CulturedLeukemia, Myelogenous, Chronic, BCR-ABL PositiveViral Plaque Assay