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Tracheal contraction evoked by high potassium (67 mM) and methacholine in vitro. a High potassium (67 mM) contractile response of tracheal ring. b Tracheal ring contractile response curves to 10−9-10−4 M methacholine. c The methacholine-induced contractile response normalized to the high potassium (67 mM) response. Data are presented as mean ± SEM. Numbers of mice were six per group
