thus , a new nk-2-selective tachykinin receptor antagonist , namely [ tyr5 , d-trp6,8,9 , arg10 ] nka- ( 4-10 ) , was developed that had pa2 values of 5.2 , 7.9 and 4.9 in three monoreceptor in vitro assays for nk-1 , nk-2 and nk-3 tachykinin receptors , respectively .
C0038581
nka
C0039241
tachykinin