Repressor ProteinsOperator Regions, GeneticPeptide Nucleic AcidsLac RepressorsMolecular Sequence DataBase SequenceTranscription FactorsDNA-Binding ProteinsBacterial ProteinsEscherichia coliTranscription, GeneticOperonNucleic Acid ConformationDNAPromoter Regions, GeneticIsopropyl ThiogalactosideAmino Acid SequenceProtein BindingBinding SitesViral Regulatory and Accessory ProteinsGene Expression Regulation, BacterialPlasmidsNucleic Acid ProbesDNA, BacterialGenes, RegulatorMutationNucleic Acid Amplification TechniquesEscherichia coli ProteinsNucleic Acid HybridizationCloning, MolecularNucleic Acid DenaturationZinc FingersRNAGenes, BacterialBacteriophage lambdaGene Expression RegulationLysogenyLac OperonRecombinant Fusion ProteinsViral ProteinsNuclear ProteinsRNA, MessengerDNA FootprintingModels, MolecularOligonucleotidesDNA, ViralLactoseCell LineRegulatory Sequences, Nucleic AcidHistone DeacetylasesElectrophoretic Mobility Shift AssayColiphagesEnzyme RepressionTrans-ActivatorsProtein Structure, TertiaryRestriction MappingKineticsProtein ConformationProtein BiosynthesisSequence AlignmentSequence Homology, Amino AcidTetracyclineConsensus SequenceSequence Homology, Nucleic AcidDimerizationDeoxyribonuclease ITransfectionRNA-Binding ProteinsGenes, ReporterRNA, BacterialCarrier ProteinsTwo-Hybrid System TechniquesPolymerase Chain ReactionMutagenesis, Site-DirectedHeLa CellsCell NucleusDrosophila Proteinsbeta-GalactosidaseDNA PrimersRecombinant ProteinsGene Expression Regulation, FungalOligonucleotide ProbesHomeodomain ProteinsBasic Helix-Loop-Helix Transcription FactorsGene Expression Regulation, DevelopmentalStructure-Activity RelationshipModels, GeneticSaccharomyces cerevisiaeCircular DichroismThermodynamicsGene SilencingSequence Analysis, DNAGenesSaccharomyces cerevisiae ProteinsBacillus subtilisSelf-Sustained Sequence ReplicationTranscriptional ActivationModels, BiologicalTryptophanDrosophila