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Signal transduction systems, including cholinergic pathways, which are likely to be of pathophysiological significance are altered in Alzheimer's disease (AD). Muscarinic cholinergic receptors are linked to the hydrolysis of phosphoinositide, involving the production of inositol 1,4,5-trisphosphate [Ins (1,4,5)P3] and the mobilization of cytosolic free calcium concentrations ([Ca2+]i). Effects of...