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ULTRASTRUCTURAL CHANGES IN THE STORAGE CELLS OF THE PYLORIC CAECA OF THE SEA STAR ASTERIAS RUBENS L. (ECHINODERMATA: ASTEROIDEA) DURING THE REPRODUCTIVE CYCLE by P.J. DEN BESTEN1,*, E.G. VAN DONSELAAR1, P.A. VOOGT2 and H.J. HERWIG1 (1 Research Institute of Toxicology and 2 Research Group for Invertebrate Reproductive Physiology, University of Utrecht, P.O. Box 80.176, NL-3508 TD Utrecht, The Netherlands) ABSTRACT At six week time intervals between August and June, samples were taken from the pyloric caeca of female sea stars, Asterias rubens, in order to study the ultrastructural organization of the storage cells. In August, at the start of the phase of gonadal growth, the storage cells are characterized by the presence of a large number of storage granules, an elaborate RER in the perinuclear region, and lipid droplets located in the basal part of the cells. The strongly dilated cisternae of the RER are filled with a fine granular glycoproteinous material. From October onwards, during the phase of gonadal growth, the size of the RER gradually decreases, while the Golgi system becomes increasingly active. The Golgi system produces dense-core vesicles which accumulate near the basal membrane, indicating that their content is transferred to the mesenterial connective tissue
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1993
Keywords: storage cells; sea star; ultrastructural organization; pyloric caeca; Asterias rubens; reproductive cycle
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