Fig. 5. (A) Response of basolateral membrane potential (V_bl) to different bathing K⁺ concentrations in the presence of Ba²⁺. The depolarization of V_bl when changing the [K⁺] from 5 mmol l^-1 to 140 mmol l^-1 is followed by a repolarization after 3-8 min. (B) Summary of the effect of Ba²⁺ in various [K⁺]. Data are presented as means ± 1 S.E.M. (n=6).