Enhancer Elements, GeneticOperator Regions, GeneticBase SequenceOperonRepressor ProteinsMolecular Sequence DataPromoter Regions, GeneticGenes, RegulatorEscherichia coliBacterial ProteinsGene Expression Regulation, BacterialDNA, BacterialMutationGenes, BacterialTranscription FactorsBinding SitesDNA-Binding ProteinsProtein BindingTranscription, GeneticGene Expression RegulationPlasmidsCell LineAmino Acid SequenceRegulatory Sequences, Nucleic AcidNuclear ProteinsDNALac OperonDeoxyribonuclease ITransfectionDNA FootprintingGenes, ReporterHIV EnhancerGene Expression Regulation, DevelopmentalChloramphenicol O-AcetyltransferaseCloning, MolecularRecombinant Fusion ProteinsTrans-ActivatorsLac RepressorsHeLa CellsRestriction MappingHomeodomain ProteinsSequence Homology, Nucleic AcidIntronsRepetitive Sequences, Nucleic AcidProtein Structure, TertiaryDrosophila ProteinsNucleic Acid ConformationMEF2 Transcription FactorsConserved SequenceRNA, MessengerMyogenic Regulatory FactorsMutagenesis, Site-DirectedTranscriptional ActivationChromatinMice, TransgenicViral Regulatory and Accessory ProteinsModels, MolecularOligodeoxyribonucleotidesSequence DeletionRecombinant ProteinsDrosophilaBinding, Competitivebeta-GalactosidaseDNA PrimersCell NucleusKineticsCells, CulturedModels, GeneticDNA, ViralCCAAT-Enhancer-Binding ProteinsElectrophoretic Mobility Shift AssayGenesComputer TerminalsRadiation ProtectionConsensus SequenceSequence Homology, Amino AcidSequence AlignmentTumor Cells, CulturedProtein ConformationROC CurveEscherichia coli ProteinsTransgenesIsopropyl ThiogalactosideExonsLuciferasesOrgan SpecificityRNA-Binding ProteinsCarrier ProteinsFluoroscopyBasic Helix-Loop-Helix Transcription FactorsDrosophila melanogasterChromatin ImmunoprecipitationGene Expression Regulation, ViralAnimals, Genetically ModifiedGene ExpressionRadiation MonitoringMutagenesisSimian virus 40DNA Mutational AnalysisDimerization