in the small intestine , somatostatin- , gastrin- , cck- , motilin- , neurotensin- , secretin- , substance p- , glucagon- , glicentin- and bpp-immunoreactive cells were found and were most numerous in the duodenum except for neurotensin- , glucagon- and glicentin-immunoreactive cells which were more concentrated in the ileum .
C0021852
small intestine
C0013303
duodenum