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Respiratory signs in sensitized challenged guinea pigs. Evaluation of latency for the onset of cough (A), severity of cough (B), latency for the onset of dyspnoea (C), pressure of airway opening (PAO) after MeCh (200 μg/ml) aerosol (D). Data are means ± SEM. ###P < 0.001 versus Naive; **P < 0.01 and ***P < 0.001 versus Vehicle.
