Fine Structure of the Zona Pellucida and the Attaching Filaments in Oocytes from the Teleosts
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The ultrastructure of zona pellucida and attaching filaments in oocytes from Cyprinodon variegatus and Oryzias latipes was observed by means of a transmission and scanning electron microscopy. The zona pellucida consisted of two layers, the electron dense zona externa, and slightly less dense zona interna. The interna whose thickness was much thicker than that of the externa was composed of a highly organized substance showing spring-like or reticular appearances. The attaching filaments were stereoscopically observed by a scanning electron microscope as bfiers of two different kinds of thickness. In cross section the attaching filaments appeared to be composed of tubular units.
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