... in the Pancreas of the Carp, Cyprinus carpio (Cyprinidae) 305Category of relative frequencyThe relative frequency of occurrence of each type of IRcell was placed into one of five categories, ... subdivided into twodistinct regions according to their histological profiles, epitheliallining and sub-epithelial regions.Results In the present study, all four kinds of the IR endocrinecells ... relative frequency of endocrine cells, IR to the antisera against mammalian insulin,glucagon, somatostatin and PP, in the pancreas of teleost,localization of endocrine cells on the pancreas of...