Ultrastructural identification of cells storing pancreatic-type glucagon in dog stomach.

The oxyntic mucosa of the dog stomach is rich in cells storing pancreatic-type glucagon. The cells were identified by immunocytochemistry and found to be indistinguishable from pancreatic A cells in the electron microscope. Ultrastructural identification of the immunoreactive cells was accomplished by the use of consecutive semithin-ultrathin sections, a technique that permitted the use of optimally fixed material.