the ability of cations at a concentration of 10 ( -3 ) m to restore binding to membranes from guinea-pig ileum was in the sequence , ca++ = sr++ greater than mg++ = mn++ = co++ greater than ba++ = ni++ greater than zn++ = cd++ greater than la = sm = tm . in contrast to the activation of calmodulin-dependent processes , the ability of these cations to restore [ 3h ] nitrendipine binding did not correlate linearly with ionic radius .
C0007447
cations
C0022023
ionic