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Background In peripheral airways, acetylcholine induces contraction via activation of muscarinic M2-and M3-receptor subtypes (M2R and M3R). Cholinergic hypersensitivity is associated with chronic obstructive pulmonary disease and asthma, and therefore the identification of muscarinic signaling pathways are of great therapeutic interest. A pathway that has been shown to be activated via MR and to increase...