TetracyclineTetracyclinesRepressor ProteinsTetracycline ResistanceOxytetracyclineAnti-Bacterial AgentsOperator Regions, GeneticDoxycyclineMinocyclineLac RepressorsR FactorsEscherichia coliDrug Resistance, MicrobialMicrobial Sensitivity TestsBacterial ProteinsMolecular Sequence DataTranscription FactorsBase SequenceChlortetracyclinePlasmidsDNA, BacterialDemeclocyclinePromoter Regions, GeneticDNA-Binding ProteinsTranscription, Genetic