on the basis of the order of potency of agonists , evaluated with substance p , physalaemin , eledoisin , kassinin and neurokinin a , the preparations can be separated into three groups , the guinea-pig urinary bladder and the dog carotid artery , in which substance p is the most potent and neurokinin a the weakest tachykinin , the rabbit mesenteric vein , the guinea-pig trachea and the rat duodenum , in which the opposite order is observed and the hamster and dog urinary bladders , in which kassinin is the most potent agonist .
C0039241
tachykinin
C0022528
kassinin