Repressor ProteinsOperator Regions, GeneticLac RepressorsMolecular Sequence DataBase SequenceTranscription FactorsBacterial ProteinsEscherichia coliDNA-Binding ProteinsTranscription, GeneticOperonPromoter Regions, GeneticIsopropyl ThiogalactosideAmino Acid SequenceProtein BindingGene Expression Regulation, BacterialBinding SitesMutationViral Regulatory and Accessory ProteinsPlasmidsGenes, RegulatorDNAProtein BiosynthesisDNA, BacterialRNA, MessengerEscherichia coli ProteinsCloning, MolecularGene Expression RegulationGenes, BacterialKineticsCell LineRecombinant Fusion ProteinsLysogenyViral ProteinsLac OperonBacteriophage lambdaZinc FingersNuclear ProteinsEnzyme RepressionLactoseCells, CulturedColiphagesDNA FootprintingCycloheximideTrans-ActivatorsHistone DeacetylasesRestriction MappingCarrier ProteinsRegulatory Sequences, Nucleic AcidTetracyclineSequence Homology, Amino AcidProtein Structure, TertiaryElectrophoretic Mobility Shift AssayProtein Synthesis InhibitorsTransfectionCell NucleusRecombinant ProteinsStructure-Activity RelationshipHeLa CellsSaccharomyces cerevisiaeModels, MolecularGenes, ReporterConsensus SequenceMutagenesis, Site-DirectedNucleic Acid ConformationSequence Alignmentbeta-GalactosidaseProtein ConformationDimerizationDeoxyribonuclease IDNA, ViralTwo-Hybrid System TechniquesStereoisomerismGene Expression Regulation, FungalSignal TransductionDrosophila ProteinsModels, BiologicalGenetic Complementation TestMolecular StructureGenesBacillus subtilisElectrophoresis, Polyacrylamide GelGene Expression Regulation, DevelopmentalEnzyme InductionSaccharomyces cerevisiae ProteinsGene ExpressionBasic Helix-Loop-Helix Transcription FactorsAmino AcidsPhenotypeHomeodomain ProteinsRNA, BacterialDNA PrimersModels, GeneticTryptophanDNA ReplicationMutagenesisRNA-Binding ProteinsSequence Homology, Nucleic AcidTranscriptional ActivationAlcohol Oxidoreductases