Retroviridae InfectionsEndogenous RetrovirusesRetroviridaeGammaretrovirusHuman T-lymphotropic virus 1DeltaretrovirusAfricaSouth AfricaAntigensHistocompatibility Antigens Class IICell LineHLA-D AntigensAntigens, SurfaceAfrica South of the SaharaAntigens, BacterialAntigens, NeoplasmHLA-DR AntigensHuman T-lymphotropic virus 2Antigens, ViralDeltaretrovirus InfectionsAfrica, WesternHLA AntigensAfrica, SouthernAfrica, EasternHLA-DQ AntigensHTLV-I InfectionsT-LymphocytesMolecular Sequence DataAfrica, CentralHLA-DP AntigensAntibodies, MonoclonalDeltaretrovirus AntibodiesBetaretrovirusAntigens, CDAfrica, NorthernHistocompatibility Antigens Class IAntigens, ProtozoanAntigens, Polyomavirus TransformingHistocompatibility AntigensBase SequenceH-2 AntigensPulmonary Adenomatosis, OvineGenes, MHC Class IIRetroviruses, SimianB-LymphocytesImmunoenzyme TechniquesAntigens, FungalLeukemia Virus, MurineAmino Acid SequenceEpitopesAntigens, HelminthInterferon-gammaGenetic VectorsMajor Histocompatibility ComplexProvirusesLymphocyte ActivationFluorescent Antibody TechniqueDNA, ViralAntigens, Viral, TumorReceptors, Antigen, T-CellCells, CulturedMice, Inbred BALB CGene Products, envCarcinoembryonic AntigenHuman T-lymphotropic virus 3Terminal Repeat SequencesAntigens, CD8Enzyme-Linked Immunosorbent AssayMoloney murine leukemia virusReceptors, Antigen, B-CellAntibody SpecificitySimian T-lymphotropic virus 1Gene Products, gagRetroviridae ProteinsFlow CytometryPolymerase Chain ReactionImmunoglobulin GHLA-A AntigensProliferating Cell Nuclear AntigenGenes, ViralAntigen-Presenting CellsLymphocytesAntigens, CD3Mice, Inbred C57BLCross ReactionsReceptors, VirusAntibodies, ViralRecombinant ProteinsProstate-Specific AntigenO AntigensAntigens, CD4Antigens, Differentiation, B-LymphocyteCell Transformation, ViralGenes, envTransfectionViral Envelope ProteinsBlood DonorsAntigen PresentationPhylogenyRepetitive Sequences, Nucleic Acid