increases in external ca ( 2+ ) overcame the inhibitory action of the agents.3 divalent cations , ni ( 2+ ) , mn ( 2+ ) , co ( 2+ ) and the trivalent cation , la ( 3+ ) inhibited i ( ca ) dose-dependently , but induced shifts of the i-v relationship to more positive voltages .
C0007448
divalent cations
C0007447
cation