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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 187 (1978), S. 159-165 
    ISSN: 1432-0878
    Keywords: Endocrine cells ; Ascidian (Styela clava) ; Gut epithelium ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural studies have shown the presence of two types of granulated endocrine cell in the gut of Styela clava. Type I, which occurs in the stomach and intestine contains small irregular granules, each with a distinct halo. Type II, found only in the oesophagus contains larger rounded granules, often with little or no halo. The characteristics of these two cell types are compared with those of endocrine cells found in the digestive tracts of other protochordates and discussed with special reference to the evolution of gastrointestinal endocrine cells in vertebrates.
    Type of Medium: Electronic Resource
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