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Airway hyperresponsiveness (AHR) was assessed more directly by measuring changes in airway resistance in response to increasing concentrations of inhaled methacholine (Mch). Data are expressed as mean ± SD, n = 10 rats per group. (b): **P < 0.01, *P < 0.05, versus the NC group; # P < 0.05, versus the AC group. (c): **P < 0.01, *P < 0.05, versus the KYDS group or the KYDSA group or the ASSA group; # P < 0.05, versus the KYDSA group.
