Muscarinic acetylcholine receptors are G protein-coupled receptor complexes in the cell membranes of certain neurons and cells. They play several roles, including acting as the main end-receptor stimulated by acetylcholine released from postganglionic fibers in the parasympathetic nervous system. This 3D printed protein model of muscarinic acetylcholine receptor is visualized by its ribbon structure highlighting the protein’s transmembrane active sites.

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