These cells are not randomly distributed in the islet,
rather beta cells occupy the central portion of the islet
and are surrounded by an outer layer of alpha and
delta cells (Bowen 1999). One further product of the
islets is pancreatic polypeptide (PP), produced by the
PP cell, although its function is not clear (Guyton and
Hall 1996). Both glucagon and insulin regulate the
serum blood glucose levels. Hence, if the pancreas
becomes damaged, this regulatory system might