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Abstract. By combining cryofixation and cryosubstitution in a structural and functional analysis of the nucleus of Saccharomyces… Expand The nucleolus, the site of ribosomal RNA synthesis, provides us with one of the best opportunities for unravelling the… Expand Cell death by apoptosis mediates several important physiologic and pathologic processes and appears to be intrinsically… Expand Autoimmune serum from a patient with scleroderma was shown by indirect immunofluorescence to label nucleoli in a variety of cells… Expand The simultaneous ultrastructural localization of the Ag-NOR proteins and ribonucleoproteins (RNP) was carried out during mitosis… Expand The emergence of newly formed nucleoli and their development have been studied in mouse oocytes from pachytene to diplotene… Expand Prophase I meiosis was studied in the human oocyte obtained from 16- to 24-week-old fetuses. Electron microscopy and silver… Expand Abstract We adapted the Ag-As procedure for staining the nucleolus organizer regions (NORs) to the ultrastructural level, under… Expand In the quail, the somatic ovarian cell and oocyte nucleoli are composed of a fibrillar center which is constantly surrounded by a… Expand The mouse oocyte is the site of nucleolar synthesis during pachytene. The chromosomes containing a nucleolar organizer are… Expand