in an attempt to determine if the selectivity of secoverine observed in vivo and in isolated tissues might be due to selective association with muscarinic receptor subtypes , we analyzed the binding of secoverine to three different receptors with specific radioligands : rat cardiac receptors ( m2 receptors with low affinity for atropine ) , and rat cerebral cortical m1 receptors and m2 receptors with high affinity for atropine .
C0034826
muscarinic
C0531859
m1 receptors