the receptors were selectively blocked by the tachykinin antagonist [ d-pro2 , d-trp7,9 ] substance p but not by muscarinic , gastrin/cholecystokinin , or opiate antagonists ( 0.3 nm atropine , 1 mm proglumide , and 0.3 nm naloxone , respectively ) .
C0039241
tachykinin
C0038585
substance p