Transepithelial electrical resistance (TER) of human lung epithelial cells (HLEC) (Top) and Caco-2 (Bottom) monolayers exposed to control or cytomix-treated media as measured over time (values are mean ± SEM). Although a transitory drop in TER was observed in HLEC monolayers 24 h after cytomix treatment, resistance returned towards control levels thereafter. Conversely, TER fell progressively over time in Caco-2 monolayers, particularly following cytomix treatment (*P<0.05, compared to baseline; †P<0.05, relative to baseline and corresponding time-matched controls).