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Acetylcholine produces concentration-dependent inward currents in HEK293 cells expressing adult muscle-type acetylcholine receptors. (A) Representative recordings of currents from a single HEK293 cell elicited by 1, 10, 50, 100, and 500 μmol/L acetylcholine (horizontal bars). (B) Concentration-response curve for acetylcholine on adult muscle-type acetylcholine receptor. Data points show the mean±SD of 5 HEK293 cells.
