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Effect of aerosolized ruthenium red (RR, 3 mM), (+)camphor [(+)CAM, 1 mM], HC-030031 (0.3 mM) or capsazepine (CPZ, 10 µM) on cigarette smoke-induced cough in guinea pig. VEH indicates results obtained by cigarette smoke after pretreatment with 6% dimethyl sulphoxide and 3.5% Tween-80. *P < 0.05, analysis of variance and Bonferroni's test versus VEH. Each column is presented as mean ± SE of at least six experiments.
