OperonrRNA OperonGene Expression Regulation, BacterialLac OperonGenes, BacterialBacterial ProteinsEscherichia coliMolecular Sequence DataBase SequenceTranscription, GeneticDNA, BacterialEscherichia coli ProteinsRNA, BacterialBacillus subtilisPromoter Regions, GeneticGenes, RegulatorAmino Acid SequenceCloning, MolecularMutationRestriction Mapping