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Original recording of the effects of cromolyn on 10−6 M of methacholine-induced contraction of rat trachea. Cromolyn had a minimal effect on 10−6 M of methacholine-induced contraction of rat trachea as the concentration increased. The total relaxation of the 10−6 M methacholine-induced contracted tracheal strip was observed when adding 10−6 M of atropine among the specimens treated with cromolyn.
