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A B Figure S1. Natural transformation frequency of JB202 and BQ304. Donor DNA with a tetracycline resistance marker [tet(O)] and kanamycin resistance marker (aphA3) were used in experiments A and B, respectively. The results showed that in comparison with wild-type 11168, mutation of hipO (JB202) and dcuA (BQ304) did not have a significant effect on the natural transformation frequency in C. jejuni.