[Changes in the rat endocrine pancreas under the effect of urbazon].

Hypertrophy and hyperplasia of islet tissue, established by morphometry, were proved in the pancreas of rats, treated chronically for a period of 2 months (with urbason-50 mg/kg of body mass). B-cells were granulated. Structures with myelin-like form of membranes were observed in some of them by electron microscope. Mixed islet B-acinar cells were established as well. These data were possibly a morphological expression of stimulating action of urbason on B-cells of Langerhans islets.