AKR murine leukemia virusLeukemia Virus, MurineMice, Inbred AKRXenotropic murine leukemia virus-related virusMoloney murine leukemia virusRetroviridae InfectionsFriend murine leukemia virusGammaretrovirusLeukemia, ExperimentalAbelson murine leukemia virusFatigue Syndrome, ChronicDNA ContaminationRauscher VirusLeukemia Virus, FelineRetroviridaeDNA, ViralMinkLeukemia Virus, BovineGenes, ViralCell LineMink Cell Focus-Inducing VirusesTumor Virus InfectionsVirus ReplicationReceptors, VirusMice, Inbred StrainsLeukemiaMolecular Sequence DataVirus IntegrationBase SequenceRNA-Directed DNA PolymeraseProvirusesGene Products, gagSarcoma Viruses, MurineViral Envelope ProteinsRecombination, GeneticViral ProteinsHelper VirusesRNA, ViralLeukemia, Myeloid, AcuteMice, Inbred C57BLAmino Acid SequenceLeukemia Virus, Gibbon ApeGene Products, env