further , studies on the relationships between receptor occupancy of muscarinic acetylcholine receptors in this tissue , measured by [ 3h ] qnb binding , and the cch-stimulated pip2 hydrolysis , mlc phosphorylation and contraction revealed that all of these responses are coupled to the m2 receptor subtype .
C0034826
muscarinic acetylcholine receptors
C0384752
m2 receptor