prenatal development of rat pancreatic endocrine cells was investigated by the immunoperoxidase technique and the following results were obtained : 1 ) glucagon immunoreactive cells are first endocrine element of the pancreas appearing already on day 11 of gestation , when the dorsal pancreatic bud is still quite small and the ventral pancreatic primordium is hardly swollen out .
C0030280
glucagon
C0022131
endocrine