the effects of monovalent ( na+ , li+ , k+ , rb+ ) and divalent ( ca2+ , mg2+ , mn2+ ) cations on dihydropyridine calcium antagonist binding sites in brain and cardiac membranes were investigated using a low ionic strength buffer ( 5 mm tris-hcl , ph 7.4 ) , and the dihydropyridine , [ 3h ] -nitrendipine .
C0012315
dihydropyridine
C0028127
nitrendipine