additionally , more a-fiber endings located in contractile ( gut or vasculature ) than in noncontractile ( pancreas , liver , or spleen ) regions responded to 5-ht ( 58 vs. 19 % ) , bradykinin ( 67 vs. 15 % ) , and substance p ( 57 vs. 29 % ) , a response that frequently occurred coincident with the development of chemically induced gut contractions .
C0026820
contractile
C0006100
bradykinin