GammaretrovirusLeukemia Virus, MurineRetroviridae InfectionsXenotropic murine leukemia virus-related virusLeukemia Virus, FelineMoloney murine leukemia virusLeukemia Virus, BovineLeukemiaPhascolarctidaeWhale, KillerFriend murine leukemia virusLeukemia, ExperimentalReceptors, VirusAKR murine leukemia virusTumor Virus InfectionsEndogenous RetrovirusesLeukemia, Myeloid, AcuteMolecular Sequence DataDNA ContaminationCell LineTerminal Repeat SequencesHuman T-lymphotropic virus 1Gene Products, envDNA, ViralAbelson murine leukemia virusVirus ReplicationLeukemia Virus, Gibbon ApeLeukemia, Lymphocytic, Chronic, B-CellFatigue Syndrome, ChronicRauscher VirusRetroviridaeRNA VirusesGene Products, taxLeukemia, LymphoidAmino Acid SequenceGenes, ViralVaccinia virusPhylogenyDefective VirusesVirus CultivationEnzootic Bovine LeukosisRNA, ViralLeukemia, Myelogenous, Chronic, BCR-ABL PositiveViral ProteinsVirus AssemblyProvirusesBase SequenceLeukemia, T-CellRNA-Directed DNA PolymeraseCell Transformation, ViralMice, Inbred AKRGene Products, gagAntigens, ViralSimian virus 40Virus IntegrationVirus SheddingSarcoma Viruses, MurineRetroviridae Proteins, OncogenicVirus DiseasesLeukemia-Lymphoma, Adult T-CellOncogenic VirusesHuman T-lymphotropic virus 2DeltaretrovirusVirionPrecursor Cell Lymphoblastic Leukemia-LymphomaRepetitive Sequences, Nucleic AcidGene Expression Regulation, ViralGenetic VectorsRadiation Leukemia VirusMice, Inbred StrainsPlant VirusesDNA VirusesSindbis VirusHylobatesAvian leukosis virusMink Cell Focus-Inducing VirusesCells, CulturedLeukemia, FelineT-LymphocytesMeasles virusTransfectionHTLV-I InfectionsInfluenza A Virus, H1N1 SubtypeGene Products, rexLymphomaLeukemia, Monocytic, AcuteTranscription, GeneticPreleukemiaViral Envelope ProteinsRabies virusLeukemia, Radiation-InducedLeukemia, Hairy CellGenes, pXPolymerase Chain ReactionRecombination, GeneticInfluenza A Virus, H5N1 SubtypeCatsVirus Activation3T3 CellsGenes, env