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Arrangement of three main pancreatic hormones (glucagon, insulin, and somatostatin) within the pancreas of the grass snake embryos at subsequent developmental stages. (A,D,G,J,M) Fluorescence for glucagon. (B,E,H,K,N) Fluorescence for insulin. (C,F,I,L,O) Fluorescence for somatostatin. Scale bars—50 µm.
