AKR murine leukemia virusLeukemia Virus, MurineMice, Inbred AKRXenotropic murine leukemia virus-related virusMoloney murine leukemia virusRetroviridae InfectionsFriend murine leukemia virusGammaretrovirusLeukemia, ExperimentalAbelson murine leukemia virusRauscher VirusRetroviridaeFatigue Syndrome, ChronicDNA ContaminationLeukemia Virus, FelineMinkDNA, ViralMink Cell Focus-Inducing VirusesReceptors, VirusGenes, ViralCell LineTumor Virus InfectionsVirus ReplicationMice, Inbred StrainsLeukemia Virus, BovineMolecular Sequence DataLeukemiaBase SequenceVirus IntegrationProvirusesRNA-Directed DNA PolymeraseViral Envelope ProteinsRecombination, GeneticHelper VirusesSarcoma Viruses, MurineGene Products, gagViral ProteinsRNA, ViralAmino Acid SequenceGene Products, env3T3 CellsDefective VirusesLeukemia, Myeloid, AcuteMuridaeLeukemia Virus, Gibbon Ape