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Hydrochloric acid (HCl) elicits a concentration-dependent decrease in pH (A) and trans-endothelial resistance (TER); (B)). Line in (A) represents linear regression analysis (***: p < 0.001; Pearson R2 coefficient 0.94). The maximal decrease in TER in (B) was plotted as a percentage of the basal resistance in the absence of HCl (n = 3, means ± SEM; ***: p < 0.001, one-way ANOVA with Tuckey’s).
