to determine the roles of endogenous enkephalinase ( ec.3.4.24.11 ) in regulating tachykinin-induced contraction of airway smooth muscle , the authors studied the effects of the enkephalinase inhibitor leucine-thiorphan on the contractile responses to substance p ( sp ) , neurokinin a ( nka ) and neurokinin b ( nkb ) in isolated ferret tracheal smooth muscle segments .
C0039241
tachykinin
C0027847
neurokinin b