title: [The endocrine pancreas in Varanus niloticus: ultrastructural and cytochemical electron microscopic study and X-ray microdiffraction].
abstract: Electron microscopy has confirmed that there are B and A1 insular cells in the Varanidae; nevertheless, the majority of cells are A2. It is the transformation of canalicular and acinar cells that is responsible for insular regeneration. Mixed cell type can be found very frequently. X Ray microdiffraction has shown that the beta granules contain high levels of zinc; similar concentrations are found in peri-insular exocrine cells. Seasonal sexual activity intensifies the process of exo-endocrine cellular transformation and increases both the zinc level in B and pre-B cells and the sulphur level in A2 cells.
mesh_terms: D000818:Animals; D006651:Histocytochemistry; D007328:Insulin / Q000378:metabolism; D007515:Islets of Langerhans / Q000032:analysis / Q000166:cytology / Q000648:ultrastructure*; D008116:Lizards / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D010179:Pancreas / Q000378:metabolism; D012621:Seasons; D012737:Sex Factors; D013455:Sulfur / Q000032:analysis; D014961:X-Ray Diffraction; D015032:Zinc / Q000032:analysis
chemical_list: D007328:Insulin; D013455:Sulfur; D015032:Zinc
vernacular_title: Le pancréas endocrine de Varanus niloticus: etude ultrastructurale et cytochimique en microscopie électronique et microdiffraction aux rayons X