Abstract
The M 3-selective antagonist, p-fluorohexahydro-sila-difenidol was used to characterize muscarinic receptors in two vascular preparations, the rabbit ear artery with an endothelium-dependent relaxation and the bovine coronary artery with an endothelium-independent contractile response. pK B values were consistent with the presence of M 3 receptors, 7.9 and 7.5 in coronary and ear arteries, respectively. These findings confirm that muscarinic receptors of the rabbit ear artery and bovine coronary artery have similar characteristics and belong to the M 3 subtype.
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