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Nonpolarized Caco-2 invasion assays of motA(T551G) isolates. Isolate 8/02, carrying wild-type motA, was included for comparison, as was PT4, used as a reference strain. Data are expressed as percentages of intracellular bacteria related to the initial inoculum and further normalized to the result for PT4 (considering this value equal to 100%). Means ± SEM are shown. **, significant difference compared to result for PT4 (P < 0.01).
