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Structure of the clpQY operon. The 3,683-bp BglI fragment that contains clpQY is drawn to scale. Restriction enzyme sites referred to in the text are indicated. Arrows show the direction of transcription. The inverted triangle represents the position of insertion of the cat gene, encoding chloramphenicol acetyltransferase, in the clpQ or clpY gene as described in Materials and Methods. The black bar shows the region deleted in the clpY::cat mutant.
