Rauscher VirusLeukemia, Experimentalp-FluorophenylalanineAKR murine leukemia virusGammaretrovirusRNA-Directed DNA PolymeraseLeukemia Virus, MurineMoloney murine leukemia virusRetroviridaeViral ProteinsLeukemia Virus, FelineLeukemia Virus, BovineDNA, ViralFriend murine leukemia virusLeukemiaNucleic Acid HybridizationMolecular WeightCell LineLeukemia, Myeloid, AcuteHuman T-lymphotropic virus 1Centrifugation, Density GradientVirus ReplicationRNA VirusesGenes, ViralAbelson murine leukemia virusDefective VirusesReceptors, VirusLeukemia, Lymphocytic, Chronic, B-CellLeukemia Virus, Gibbon ApeVirus CultivationGene Products, taxOncogenic VirusesLeukemia, LymphoidRetroviridae InfectionsRNA, Viral