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Enterobactin growth promotion tests of the wild-type strain C. jejuni NCTC 11168 and the mutants ΔCj0178, ΔceuE, and ΔcfrA. A halo of growth around the filter paper disk containing 10 μl of enterobactin (10 mM) indicates utilization of the siderophore by the tested strain. The diameters of growth promotion zones ± standard deviation are shown in parentheses.
