Avian leukosis virusAvian LeukosisAlpharetrovirusChickensAvian Sarcoma VirusesBursa of FabriciusAvian ProteinsChick EmbryoPoultry DiseasesReceptors, VirusReticuloendotheliosis virusSarcoma, AvianQuailGenes, polCoturnixDNA, ViralGenes, envProvirusesVirus ReplicationGenes, gagMolecular Sequence DataAvian myeloblastosis virusHemangiomaDefective VirusesHerpesvirus 2, GallidRNA, ViralGenes, ViralMarek DiseaseRepetitive Sequences, Nucleic AcidBase SequenceCell LineLymphomaEndogenous RetrovirusesRNA-Directed DNA PolymeraseRecombination, GeneticViral InterferenceCulture TechniquesTenosynovitisEnzootic Bovine LeukosisVirus IntegrationRetroviridaeOncogenesCytopathogenic Effect, ViralBirdsCell Transformation, ViralRetroviridae ProteinsGenetic VectorsAntigens, ViralAmino Acid SequenceViral Envelope ProteinsCell Transformation, NeoplasticFibroblastsNucleic Acid HybridizationSpecies SpecificityViral ProteinsRNA VirusesSequence Analysis, DNAHelper VirusesCells, CulturedVaccinia virusCloning, MolecularGenome, ViralMutationSequence Homology, Nucleic AcidVirus CultivationDNA PrimersTranscription, GeneticHistiocytic Sarcoma