Divalent cation conductivity. (A) Currents (−120 mV) of hME elicited by 20 mM of various divalent cations. Black bars indicate Ca²⁺ concentrations in mM. The voltage protocol is the same as in Fig. 6. (B) A comparison of divalent cation transport. All currents were induced by 20 mM divalent cations. Data are presented as mean ± SEM.