Changes in transepithelial electrical resistance (TEER) values in differentiated Caco-2 cells after treatment with different concentrations of aflatoxin M1 (AFM1) and ochratoxin A (OTA) individually or collectively (AFM1+OTA) for 48 h compared with the initial value. Results are expressed as the mean ± SEM of three independent experiments. TEER was measured before and after mycotoxin treatment for each condition. Different letters (a,b) indicate significant differences in TEER (p < 0.05). TEER, transepithelial electrical resistance. AFM1-0.12 represents AFM1 at 0.12 μM, AFM1-12 represents AFM1 at 12 μM, OTA-0.2 represents OTA at 0.2 μM, OTA-20 represents OTA at 20 μM, AFM1+OTA-0.12 represents the combination of AFM1 (0.12 μM) and OTA (0.2 μM), AFM1+OTA-12 represents the combination of AFM1 (12 μM) and OTA (20 μM).