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Organogenesis and differentiation of the pancreas in the toad Bufo bufo L.

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Summary

In Bufo bufo at stage III6 the first endocrine islets appear in the part of the pancreas corresponding to the dorsal anlage. At stage IV2, 5 days later, the pancreatic duct develops and new islets arise by budding off from the ductal epithelium. The ultrastructural study of the secretory granules morphology of endocrine cells has distinguished four different cell types: B-cells (stage III9), A-cells (stage IV3), D-cells (stage IV3) and a fourth type not yet identified (stage IV3). By immunocytology insulin and corticotropin-releasing factor (CRF) cells have been demonstrated at stage III9, and glucagon and somatostatin cells at stage IV1. Lastly, endocrine islets can be homogeneous (predominantly containing insulin cells, rarely glucagon cells) or heterogeneous (insulin cells at the centre and glucagon or somatostatin cells at the periphery). Hypotheses are put forward for the origin and the constitution of the different generations of endocrine islets and isolated cells.

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  1. Laboratoire de Biologie Animale A, Université de Bordeaux 1, Avenue des Facultés, F-33405, Talence Cedex, France

    Solange Rouet-Karama & Jacques Albert

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  1. Solange Rouet-Karama
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  2. Jacques Albert
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Rouet-Karama, S., Albert, J. Organogenesis and differentiation of the pancreas in the toad Bufo bufo L.. Roux's Arch Dev Biol 197, 148–156 (1988). https://doi.org/10.1007/BF00427918

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  • DOI: https://doi.org/10.1007/BF00427918

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