Enzootic Bovine LeukosisLeukemia Virus, BovineCattle DiseasesCattleAvian LeukosisAvian leukosis virusLymphocytosisLeukemiaRetroviridaeLeukemia Virus, MurineMoloney murine leukemia virusLeukemia Virus, FelineLeukemia, ExperimentalSheepProvirusesGene Products, taxMolecular Sequence DataSheep DiseasesImmunodeficiency Virus, BovineDNA, ViralGenes, pXGenes, ViralBase SequenceHuman T-lymphotropic virus 1Retroviridae Proteins, OncogenicAntibodies, ViralDeltaretrovirusCell LineFriend murine leukemia virusRNA, ViralAKR murine leukemia virusVirus ReplicationLeukemia, Myeloid, AcuteDeltaretrovirus Infections