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  • Title: Immunolocalization of insulin, glucagon, pancreatic polypeptide, and somatostatin in the pancreatic islets of the possum, Trichosurus vulpecula.
    Author: Reddy S, Bibby NJ, Fisher SL, Elliott RB.
    Journal: Gen Comp Endocrinol; 1986 Oct; 64(1):157-62. PubMed ID: 2881838.
    Abstract:
    Antibodies to insulin, glucagon, pancreatic polypeptide (PP), and somatostatin were used in the immunofluorescence procedure to demonstrate localization of the four hormones in cells of the pancreatic islets of the brushtailed possum, Trichosurus vulpecula. Most pancreatic islets revealed some differences in the topographical distribution and cell number of each endocrine cell type. Insulin immunoreactive cells were observed in most islets where they occurred as groups of cells peripherally and within the islet. In several islets glucagon cells were the predominant cell population and were distributed peripherally as well as centrally. Pancreatic polypeptide cells were fewer in number and usually occurred as single cells within the islet. Cells immunoreactive to antisomatostatin serum were observed in varying numbers in the peripheral and central regions of the islet. The present immunofluorescence study demonstrates differences in the topographical distribution of the four major pancreatic hormones between a marsupial species and several of the eutherian mammals.
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