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Organization of the exonuclease genes. rexA and rexB are organized in tandem, and their ORFs overlap by 5 bp. Putative promoters, terminators, and transposon insertion sites are shown. Bold arrows indicate ORFs. Sequence of the rexB upstream region is shown. Underlined nucleotides, putative extended −10 promoter; boxed letters, putative Shine–Dalgarno sequence; arrows above nucleotides indicate a potential hairpin; start codon is circled. Restriction sites used in cloning are shown.
