tachykinin-related peptides were potent stimulants and followed the order : [ d-tryp7,9,10 ] sp- ( 1-11 ) greater than [ d-pro2 , d-tryp7,9,10 ] sp- ( 1-11 ) greater than sp- ( 1-11 ) greater than sp- ( 1-9 ) greater than [ d-pro4 , d-tryp7,9 , leu11 ] sp- ( 4-11 ) greater than sp- ( 1-7 ) greater than sp- ( 4-11 ) greater than neurokinin a = neurokinin b , indicating that : ( a ) undecapeptide antagonists of sp behave as superagonists ;
C0039241
tachykinin
C0038581
neurokinin a