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The fate of the germinal vesicle-derived protein, nucleoplasmin, was followed in embryos and tadpoles of Xenopus using monoclonal antibodies and indirect immunofluorescent staining. Nucleoplasmin was found in all nuclei up to feeding tadpole stages. Thereafter its level decreased in all nuclei. It was not detected in nuclei of advanced tadpoles or of adults. Contrasting with another protein, N1, that was previously monitored in the nuclei of dividing gonia of both sexes, nucleoplasmin was only detected in the nuclei of ovarian oocytes starting at diplotene. Traces of nucleoplasmin have also been found in a rapidly-dividing fibroblastic cell-line by immunohistology and protein blotting.
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