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Neurokinin A (NKA) causes bronchoconstriction in asthmatic patients. In vitro both NK 1 and NK 2 receptors can mediate airway contraction. Moreover in guinea pigs, NK 3 receptors facilitate cholinergic neurotransmission. Dual tachykinin NK 1 /NK 2 receptor antagonism results in prevention of NKA-induced bronchoconstriction. We have now examined the effect of...