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Muscarinic receptors (M-Rs) for acetylcholine (ACh) belong to the class A of G protein–coupled receptors. M-Rs are activated by orthosteric agonists that bind to a specific site buried in the M-R transmembrane helix bundle. In the active conformation, receptor function can be modulated either by allosteric modulators, which bind to the extracellular receptor surface or by the membrane potential via...
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