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Acetylcholine neurotransmitter molecule, illustration
Illustration of the neurotransmitter acetylcholine as a ball-and-stick model. Acetylcholine is one of the most important neurotransmitters in the human organism and is found in both the central and peripheral nervous system. The neurotransmitter acts at two types of membrane receptors: the muscarinic and the nicotinic acetylcholine receptor., by MEDICAL GRAPHICS/MICHAEL HOFFMANN/SCIENCE PHOTO LIBRARY
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