insulin has been localized immunocytochemically to open-type gastroenteropancreatic endocrine cells in sections of bouin's-fixed upper , middle , and lower intestine from chrysemys picta , pseudemys scripta scripta , p. scripta elegans , p. floridana , sternotherus odoratus , and trionyx spinifer asper .
C0524979
gastroenteropancreatic endocrine cells
C0021853
intestine