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Effect of pretreatment with d‐AP5 (15 nmol·mL−1; i.c.v., n = 12) on DPCPX‐enhanced citric acid‐induced cough (A), changes in Penh (B) and Penh AUC (C). Values represent means + SEM. * P < 0.05, significant difference compared with vehicle alone (n = 8) and d‐AP5 alone (n = 11)‐treated animals. # P < 0.05, significant difference compared with DPCPX (3.3 nmol·mL−1)‐treated animals.
