AKR murine leukemia virusLeukemia Virus, MurineLymphoma, Non-HodgkinMice, Inbred AKRXenotropic murine leukemia virus-related virusMoloney murine leukemia virusSarcoma, ExperimentalRetroviridae InfectionsFriend murine leukemia virusGammaretrovirusLeukemia, ExperimentalLeukemia Virus, BovineAbelson murine leukemia virusLeukemia Virus, FelineRetroviridaeFatigue Syndrome, ChronicDNA ContaminationRauscher VirusDNA, ViralMinkCell LineLeukemiaGenes, ViralMink Cell Focus-Inducing VirusesVirus ReplicationTumor Virus InfectionsEnzootic Bovine LeukosisReceptors, VirusMice, Inbred StrainsMolecular Sequence DataBase SequenceVirus IntegrationRNA-Directed DNA PolymeraseProvirusesLeukemia, LymphoidSarcoma Viruses, MurineGene Products, gagViral Envelope ProteinsRecombination, GeneticViral ProteinsThymus NeoplasmsHelper VirusesRNA, ViralLymphomaAmino Acid SequenceLeukemia, Myeloid, AcuteLeukemia Virus, Gibbon ApeGene Products, envEthnology