the binding of nimodipine , a 1,4-dihydropyridine ca2+ channel antagonist , and of bay k 8644 , a ca2+ channel activator , was measured in several regions of rat brain and compared to the distribution of k+ depolarization-induced 45ca2+ uptake into synaptosomes .
C0028094
nimodipine
C0012315
dihydropyridine