Avian leukosis virusAvian LeukosisAlpharetrovirusChickensAvian Sarcoma VirusesBursa of FabriciusAvian ProteinsChick EmbryoReceptors, VirusPoultry DiseasesReticuloendotheliosis virusSarcoma, AvianQuailGenes, polCoturnixDNA, ViralGenes, envProvirusesGenes, gagVirus ReplicationAvian myeloblastosis virusHemangiomaDefective VirusesMolecular Sequence DataHerpesvirus 2, GallidRNA, ViralMarek DiseaseGenes, ViralCell LineLymphomaRepetitive Sequences, Nucleic AcidEndogenous RetrovirusesRNA-Directed DNA PolymeraseViral InterferenceBase SequenceCulture TechniquesTenosynovitisEnzootic Bovine LeukosisRecombination, GeneticRetroviridaeVirus IntegrationOncogenesCytopathogenic Effect, ViralBirdsCell Transformation, ViralRetroviridae ProteinsAntigens, ViralViral Envelope ProteinsAmino Acid SequenceFibroblastsCell Transformation, NeoplasticGenetic VectorsNucleic Acid HybridizationSpecies SpecificityRNA VirusesViral ProteinsHelper VirusesCells, CulturedVaccinia virusSequence Analysis, DNACloning, MolecularGenome, ViralVirus CultivationSequence Homology, Nucleic AcidDNA PrimersHistiocytic Sarcoma