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Electron-microscopic study of silver staining of nucleoli in growing oocytes of rat ovaries

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Summary

The nucleoli of dictyate-stage growing oocytes in rat ovaries were examined both with routine electron microscopy and electron microscopy after silver nitrate and ammoniacal silver nitrate (Ag-AS) staining. The nucleoli of the unilaminar follicular oocytes consist of twisted strands of dense fibrillar components, aggregates of granular components, and small fibrillar centers. After Ag-AS staining, silver grains are numerous on the dense fibrillar strands, fewer on the fibrillar centers, and very sporadic on the granular aggregates. The same stainability of three nucleolar components with the Ag-AS method was also confirmed in the nucleoli segregated by actinomycin D. During the transition of growing oocytes from bilaminar to plurilaminar follicle stage, the nucleolar dense fibrillar strands gradually conglomerate and are transformed into large and compact spherules. The stainability of dense fibrillar components with the Ag-AS method was lost along with this nucleolar transformation. These results may provide some new clues on the functional significance of AgAS-positive proteins in the nucleoli.

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  1. Department of Embryology, Institute for Developmental Research, Aichi Prefectural Colony, Kasugai, Aichi, Japan

    I. K. Takeuchi

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Takeuchi, I.K. Electron-microscopic study of silver staining of nucleoli in growing oocytes of rat ovaries. Cell Tissue Res. 236, 249–255 (1984). https://doi.org/10.1007/BF00214225

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