competition studies indicated the following rank order of potencies among tachykinins : nkb greater than eledoisin ( e ) greater than kassinin greater than physalaemin greater than neurokinin a ( nka ) greater than substance p ( sp ) , a result suggesting that nkb might be the endogenous ligand for [ 3h ] nkb binding sites .
C0039241
tachykinins
C0022528
kassinin