cobA-lacZ transcription was used as negative control of a gene whose transcription is not controlled by the PocR/1 ,2-PDL system ; under both conditions , cobA transcription remained unaffected .
cobA-lacZ transcription was used as negative control of a gene whose transcription is not controlled by the PocR/1 ,2-PDL system ; under both conditions , cobA transcription remained unaffected .