using the classical muscarinic antagonist 3h-n-methyl-scopolamine as radioligand and unlabelled pirenzepine ( pz ) as displacing agent , a heterogeneous muscarinic receptor population consisting of about 70 % m1-receptors and 30 % m2-receptor , can be demonstrated in crude membranes of calf sympathetic ganglia .
C0034826
muscarinic
C0531859
m1-receptors