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Insulin and somatostatin immunohistochemical pattern in six-week-old rats. Insulin: red, SST: green, and “w”: weeks. Overlay images of pancreatic islets of six-week-old Wistar (a) and Goto-Kakizaki (b) rats “G.” Only a fine granular SST positivity was observed in Wistar controls, whereas, in GK rats, individual or small groups of cells with irregular rough and dense SST positivity could be recorded. Original magnification 1000×; scale bars 12.5 μm.
