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.itsmajorlook.com/top-deal-Dallas-Cowboys-logo-Fan-Decals-3-75-x-5-p32366-top-mega/