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In larval <jats:italic>Geotria australis<\/jats:italic>, the main zones of islet proliferation are located laterally between the oesophagus and the inner edge of the two large intestinal diverticula unique to this species rather than dorsal and ventral to the oesophagus. In adult <jats:italic>Geotria australis<\/jats:italic>, the islet follicles are closely packed into a single discrete capsule which could be easily removed surgically, rather than into cranial, intermediate, and caudal cords. The differences in the adult can be related to a lack of involvement of the bile duct in islet formation during metamorphosis. While B cells were found in both larval and adult islet follicles, the P<jats:sub>I<\/jats:sub> acidophilic cells and argyrophilic cells, which appeared respectively at stages 3 and 4 in metamorphosis, were present in all adult stages.<\/jats:p>","DOI":"10.1002\/jmor.1051840302","type":"journal-article","created":{"date-parts":[[2005,2,24]],"date-time":"2005-02-24T17:47:51Z","timestamp":1109267271000},"page":"253-261","source":"Crossref","is-referenced-by-count":27,"title":["The morphology and histology of the endocrine pancreas of the Southern Hemisphere lamprey, <i>Geotria australis<\/i> gray"],"prefix":"10.1002","volume":"184","author":[{"given":"R. W.","family":"Hilliard","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.","family":"Epple","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"I. 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