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MTT values (expressed as Optical Density – OD) of Caco-2 cells directly exposed for 2 h to the complex microbial community of the ascending colon of a SHIME reactor (direct contact), exposed to the same microbial community within a HMI module (HMI 1 and 2) or to sterile SHIME medium (control) for 48 h. Values are averages ± standard deviation (n = 2). * = statistically different from the control condition according to a Student’s two-tailed t-test (p < 0.05).
