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The hadABC genes are coexpressed with translation process and transcription regulator genes. Transcription units were identified by RT-PCR. The forward (F1 to -6) and reverse (R1 and -2) primers used to identify the transcription units as well as the primer used to synthesize the cDNA (RRT) are symbolized by arrows below the genetic map. Results of representative PCRs on reverse transcriptase-treated (+) or untreated (−) templates run on agarose gels are shown. M, DNA ladder.
