Five muscarinic acetylcholine (mACh) receptor subtypes are divided into two classes: the M1 class (M1. M3. and M5) and the M2 class (M2 and M4). The former is coupled to Gq proteins. https://www.nacrack.com/mega-pick-As-for-Me-and-My-House-Wall-Decal-in-Hebrew-Yahauh-flash-find/