it may be suggested on the basis of these experimental results that 1 ) the muscarinic ach receptor of bullfrog atrial muscle may compose a receptor-ionic channel complex ( ricc ) with voltage-dependent ca2+ channel and 2 ) the molecular reaction between this ricc and agonist may be comparable to that occurring in the nicotinic ricc of the frog end-plate .
C0034792
ach receptor
C0034830
nicotinic ricc