Fig. 3. TEER (A, C, E) and capacitance values (B, D and F) after apical incubation of the Caco-2 barrier with thio-DMA^V (A and B), arsenite (C and D) and oxo-DMAA^V, oxo-DMAE^V, thio-DMAA^V and thio-DMAE^V (E and F) data, expressed as % of an initial value; shown are representative measurements. Absolute TEER and capacitance were on average 1600 Ω cm² and 4.5 μF cm^–2, respectively.