“The antihistamines mepyramine (1 μM) … μM), the leukotriene antagonist zafirlukast (0.1 μM), or the cyclooxygenase enzyme (COX) inhibitor diclofenac (10 … a parallel and rightward shift in the dose-response relation for OVA , providing evidence for contributions of histamine, cysteinyl-leukotrienes, … to the OVA-induced bronchoconstriction in the IPL.”