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Glucagon, somatostatin, and insulin immunohistochemical pattern of pancreatic islets (a), (b) glucagon: red and SST: green; (c), (d) insulin: red, glucagon: green, and “w”: weeks. Overlay images of pancreatic islets of 31-week-old Wistar (a) and Goto-Kakizaki (b) rats “G” and 79-week-old Wistar (c) and Goto-Kakizaki (d) rats “G.” Original magnification is 400x in (a), (b) and 600x in (c), (d); scale bars 20 μm.
