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Positions of rrn loci and nature of purHD duplication endpoints. The genetic map indicates the position of rrn loci on the circular S. enterica chromosome. The expanded top region shows the purHD region analyzed here. Map distances are not to scale. The distribution of duplications that include the purHD locus is based on 30 purH duplications isolated in a recA+ strain and 20 duplications (in parentheses) isolated in a recA mutant strain.
