Structure, histochemistry and formation of the podocyst and cuticle of Aurelia aurita
Chapman, D.M. (1968) Structure, histochemistry and formation of the podocyst and cuticle of Aurelia aurita. Journal of the Marine Biological Association of the United Kingdom, 48 (1). pp. 187-208.
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At the junction between the scyphistoma's scyphopharynx-filament complex and its endoderm is a narrow zone of simple columnar cells. These cells can transform into amoebocytes which collect together and work their way to the aboral end of the polyp, where they secrete a cuticular encasement, thus forming the podocyst. Light and electron microscopy, as well as histochemistry, show the podocyst to be a lamellated tanned chitin-protein complex covering the protoplasmic contents, which have a nucleated outer clear cytoplasmic layer and a yolky central zone which may be liquefied in places. The protein-phenolic nature of certain ectodermal granules is described and shown likely to be important in cuticle formation. A modification involving the incorporation of an iron mordant in Pearse's acid Solochrome cyanine technique is presented.
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