these compounds , namely septide [ ( pglu6 , pro9 ] substance p6-11 hexapeptide ) , which preferentially acts on the nk-1 ( sp-p ) receptor , and senktide ( succinyl- [ asp6 , me-phe8 ] substance p ( 6-11 ) hexapeptide ) , which selectively acts on the nk-3 ( or sp-n ) receptor , were now used to identify the tachykinin receptors present in several smooth muscle systems .
C0164209
sp-p
C0075766
tachykinin receptors