Lac RepressorsRepressor ProteinsOperator Regions, GeneticIsopropyl ThiogalactosideBacterial ProteinsMolecular Sequence DataBase SequenceTranscription FactorsDNA-Binding ProteinsEscherichia coliOperonPromoter Regions, GeneticTranscription, GeneticEscherichia coli ProteinsLac OperonGene Expression Regulation, BacterialAmino Acid SequenceProtein BindingBinding SitesMutationViral Regulatory and Accessory ProteinsGenes, RegulatorPlasmidsDNA, BacterialBacteriophage lambdaGenes, BacterialDNACloning, MolecularLactoseRecombinant Fusion ProteinsLysogenyZinc FingersGene Expression RegulationNuclear ProteinsDNA FootprintingHistone DeacetylasesEnzyme RepressionViral ProteinsProtein Structure, TertiaryTrans-Activatorsbeta-GalactosidaseRegulatory Sequences, Nucleic AcidMutagenesisTetracyclineGenes, ReporterMutagenicity TestsRNA, MessengerElectrophoretic Mobility Shift AssayRestriction MappingColiphages