Operator Regions, GeneticOperonRepressor ProteinsBase SequenceEscherichia coliBacterial ProteinsMolecular Sequence DataGenes, RegulatorGene Expression Regulation, BacterialPromoter Regions, GeneticDNA, BacterialGenes, BacterialMutationProtein BindingBinding SitesAmino Acid SequenceLac RepressorsLac OperonDNA-Binding ProteinsTranscription FactorsViral Regulatory and Accessory ProteinsPlasmidsModels, MolecularComputer TerminalsProtein Structure, TertiaryRadiation ProtectionROC CurveNucleic Acid ConformationIsopropyl ThiogalactosideDNA FootprintingFluoroscopyDNAEscherichia coli ProteinsKineticsRadiation MonitoringProtein ConformationOccupational ExposureRecombinant Fusion ProteinsReproducibility of ResultsRadiography, Interventional