RetroviridaeEndogenous RetrovirusesRetroviridae InfectionsLeukemia Virus, MurineMoloney murine leukemia virusBetaretrovirusPulmonary Adenomatosis, OvineRetroviruses, SimianGenetic VectorsCell LineMolecular Sequence DataBase SequenceProvirusesGammaretrovirusFriend murine leukemia virusTerminal Repeat SequencesLeukemia, ExperimentalMice, Inbred C57BLGene Products, gagMice, Inbred BALB CDNA, ViralSarcoma Viruses, MurineMason-Pfizer monkey virusRNA-Directed DNA PolymeraseGene Products, envRetroviridae ProteinsReceptors, VirusTransduction, GeneticGenes, gagAvian leukosis virusAmino Acid SequenceVirus IntegrationGenes, ViralRepetitive Sequences, Nucleic AcidTumor Virus InfectionsTransfectionVirus ReplicationGenes, envCells, CulturedGenes, polCell Transformation, ViralReticuloendotheliosis virusViral Envelope ProteinsCloning, MolecularRNA, ViralAlpharetrovirusMice, Inbred Strains3T3 CellsOncogenesAKR murine leukemia virusGene Transfer TechniquesDisease Models, AnimalRNA, MessengerVirionAvian Sarcoma VirusesAvian myeloblastosis virusGenetic TherapySpleenTranscription, GeneticGene Products, polHematopoietic Stem CellsMoloney murine sarcoma virusViral ProteinsLeukemia Virus, FelineHelper VirusesSpecies SpecificityMonkey DiseasesSpumavirusRecombination, GeneticT-LymphocytesPolymerase Chain ReactionGene ExpressionDefective VirusesMice, Inbred C3HTumor Cells, CulturedGene Expression RegulationMice, Inbred AKRCercopithecidaeMurine Acquired Immunodeficiency SyndromeHexadimethrine BromideMutationEpsilonretrovirusDeltaretrovirusCell DifferentiationRetroviridae Proteins, OncogenicGene Expression Regulation, ViralBlotting, SouthernMice, KnockoutCell Transformation, NeoplasticRecombinant ProteinsXenotropic murine leukemia virus-related virusHarvey murine sarcoma virusMammary Tumor Virus, MouseRauscher VirusGenome, ViralAbelson murine leukemia virusCell DivisionPromoter Regions, GeneticSequence Homology, Nucleic AcidChick Embryo