Avian leukosis virusAvian LeukosisAlpharetrovirusChickensAvian Sarcoma VirusesBursa of FabriciusAvian ProteinsChick EmbryoReceptors, VirusPoultry DiseasesReticuloendotheliosis virusSarcoma, AvianQuailAntibodiesGenes, polCoturnixDNA, ViralGenes, envProvirusesMolecular Sequence DataGenes, gagVirus ReplicationAvian myeloblastosis virusHemangiomaDefective VirusesHerpesvirus 2, GallidRNA, ViralAntibodies, ViralMarek DiseaseGenes, ViralCell LineLymphomaRepetitive Sequences, Nucleic AcidEndogenous RetrovirusesRNA-Directed DNA PolymeraseBase SequenceViral InterferenceAntibody SpecificityCulture TechniquesTenosynovitisEnzootic Bovine LeukosisRecombination, GeneticRetroviridaeVirus IntegrationAntigens, ViralAmino Acid SequenceOncogenesCytopathogenic Effect, ViralBirdsRetroviridae ProteinsViral Envelope ProteinsCell Transformation, ViralAntibodies, MonoclonalFibroblastsAntibodies, BacterialCell Transformation, NeoplasticGenetic VectorsSpecies SpecificityNucleic Acid HybridizationViral ProteinsRNA VirusesCells, CulturedAntibodies, NeutralizingAntibody FormationHelper VirusesVaccinia virusSequence Analysis, DNACloning, MolecularGenome, ViralVirus CultivationFluorescent Antibody TechniqueDNA PrimersSequence Homology, Nucleic AcidB-LymphocytesHistiocytic SarcomaChina