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Relationship between Campylobacter jejuni strains based on the sequences of quinolone resistance-determining region (QRDR) of the gyrA gene in comparison to clonal complex (CC). The position of silent mutations in relation to the reference strain C. jejuni NCTC 11158 are shown on the branches. The accession numbers of the sequences are shown in parentheses after the strain designation. ND, Not determined.
