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The fine structure of the yolk nucleus in oocytes of Antedon bifida (Pennant) (Echinodermata: Crinoidea)

Published online by Cambridge University Press:  11 May 2009

Nicholas D. Holland
Affiliation:
Division of Marine Biology, Scripps Institution of Oceanography Box 1529, La Jolla, California, U.S.A.

Abstract

The yolk nucleus of Antedon bifida is a large, intensely basophilic structure located in the cytoplasm of small to medium-sized oocytes. Electron microscopy reveals that this yolk nucleus is a conglomeration of hundreds of dense clumps. Each clump, which is a micrometer or two in diameter, consists of finely fibrogranular material in which are embedded ribosome-like particles. Also present in the oocyte cytoplasm are perinuclear dense granules, which may well be the precursors of the clumps making up the yolk nucleus. The yolk nucleus does not appear to participate directly in the elaboration of the yolk granules.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1976

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