Operator Regions, GeneticOperonRepressor ProteinsBase SequenceEscherichia coliBacterial ProteinsMolecular Sequence DataGenes, RegulatorGene Expression Regulation, BacterialPromoter Regions, GeneticDNA, BacterialGenes, BacterialMutationProtein BindingBinding SitesAmino Acid SequenceHost SpecificityLac OperonLac RepressorsDNA-Binding ProteinsTranscription FactorsPlasmidsHost-Parasite InteractionsHost-Pathogen InteractionsCell LineViral Regulatory and Accessory ProteinsProtein Structure, TertiaryModels, MolecularEscherichia coli ProteinsViral ProteinsKineticsComputer TerminalsNucleic Acid ConformationDNARadiation ProtectionROC CurveCloning, MolecularDNA FootprintingIsopropyl ThiogalactosideProtein ConformationRecombinant Fusion ProteinsRecombinant ProteinsFluoroscopyRadiation MonitoringSequence Homology, Amino AcidOccupational ExposureCarrier ProteinsReproducibility of ResultsTime FactorsBacteriophage lambdaBinding, CompetitiveRadiography, Interventional