Avian leukosis virusAvian LeukosisAlpharetrovirusChickensAvian Sarcoma VirusesBursa of FabriciusAvian ProteinsChick EmbryoPoultry DiseasesReceptors, VirusReticuloendotheliosis virusSarcoma, AvianQuailGenes, polCoturnixDNA, ViralGenes, envProvirusesMolecular Sequence DataGenes, gagAvian myeloblastosis virusVirus ReplicationHemangiomaDefective VirusesHerpesvirus 2, GallidRNA, ViralMarek DiseaseCell LineGenes, ViralBase SequenceRepetitive Sequences, Nucleic AcidLymphomaEndogenous RetrovirusesRNA-Directed DNA PolymeraseViral InterferenceTenosynovitisCulture TechniquesEnzootic Bovine LeukosisRecombination, GeneticRetroviridaeVirus IntegrationAmino Acid SequenceOncogenesCytopathogenic Effect, ViralBirdsRetroviridae ProteinsCell Transformation, ViralViral Envelope ProteinsAntigens, ViralFibroblastsCell Transformation, NeoplasticGenetic VectorsNucleic Acid HybridizationDimerizationRNA VirusesViral ProteinsSpecies SpecificityHelper VirusesCells, CulturedVaccinia virusSequence Analysis, DNACloning, MolecularGenome, ViralDNA PrimersVirus CultivationSequence Homology, Nucleic AcidTranscription, GeneticHistiocytic SarcomaSequence Homology, Amino Acid