neurotensin given intra-arterially in bolus doses to the canine small intestine inhibited field-stimulated , atropine-sensitive contractile responses in the duodenum ( mean effective dose ( ed50 ) = 3.2 x 10 ( -11 ) mol ) and in the ileum ( mean ed50 = 2.1 x 10 ( -11 ) mol ) .
C0021852
small intestine
C0013303
duodenum