OperonRibosomal ProteinsEuglena gracilisEscherichia coliGenes, BacterialGene Expression Regulation, BacterialBacterial ProteinsBase SequenceMolecular Sequence DataTranscription, GeneticGenesProtein BiosynthesisrRNA OperonLac OperonDNA, BacterialEscherichia coli ProteinsRNA, BacterialBacillus subtilisPromoter Regions, GeneticGenes, RegulatorAmino Acid SequenceCloning, MolecularMutationRestriction MappingGenetic Complementation TestRepressor ProteinsMutagenesis, InsertionalSequence Analysis, DNAbeta-GalactosidaseSalmonella typhimuriumChromosomes, BacterialMultigene FamilyDNA Transposable ElementsChromosome MappingOpen Reading FramesRegulonGenome, BacterialEnzyme Repression