Abstract
Application of NOR silver staining to Pleurodeles oocyte nuclei showed selective silver deposits on the fibrillar part of the nucleoli in situ. This staining was adapted to nucleoli spread on grids, by a procedure which allowed the spreading of transcription units from both nucleoli and lampbrush chromosomes on the same grids. This permitted localization of the predominant nucleolar Ag-stained proteins on the nucleolar transcriptional units and not on the lampbrush chromosomes. These proteins were found exclusively on the transcribed part of the nucleolar genes and were not seen in apparently untranscribed spacer regions. The proteins seemed preferentially located on the DNP axis rather than on the RNP fibrils.
Published Version
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