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Immunocytochemical demonstration of M1 muscarinic acetylcholine receptors at the presynaptic and postsynaptic membranes of rat diaphragm endplates: A. I. Malomouzh ... [et al.]

M1-muscarinic acetylcholine (ACh) receptors (M1R) were directly demonstrated immunocytochemic ally in electronmicroscopic images of rat diaphragm neuromus cular junctions (NMJ). Specific electron-dense granules were located at presynaptic nerve ending membranes and in the sa rcolemma in the depths of postsynaptic folds. This first visualization of M1R on both sides of the NMJ is in agreement with …