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TER across Caco-2/HT29-MTX co-culture monolayers during invasion of S. Typhimurium N-15 in DMEM (A) or in the presence of a complex commensal microbiota (B, effluent) under different Fe conditions. Change in TER values as percentage of initial TER at time 0 h after 1, 2, 4, and 6 h of incubation with DMEM or fermentation effluent containing S. Typhimurium N-15. Values are means ± SEM (n = 3; High Fe effluent, n = 2).
