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- W1567498691 abstract "The distribution of 18S and 28S ribosomal RNA (rRNA), i.e. the chromosomal nucleolus organizer regions (NORs) was visualized in interphases and metaphases of non-stimulated and phytohemagglutinin (PHA)-stimulated human lymphocytes with a recently developed non-autoradiographic in situ hybridization method. This procedure involves mercurated RNA as a probe and a sulfhydryl-trinitrophenyl-mercury binding ligand and FITC-labelled antibodies as detection system. Silver staining was used to visualize nucleoli in interphase. In the secondary constriction of all ten acrocentric chromosomes, varying amounts of rDNA were detected. In the interphase nuclei of most of the non-stimulated human lymphocytes, only one small nucleolus could be seen. The in situ hybridization, however, revealed several agglomerations of rDNA scattered over the whole nuclear area, clearly outnumbering the number of nucleoli in these cells. This means that not all of the NORs are transcriptionally active in non-stimulated lymphocytes and that these inactive NORs lie at a distinct distance from the active ones. With PHA stimulation (transforming the small lymphocytes from peripheral blood into large, lymphoblast-like cells) the number of nucleoli increased slightly, whereas the number of separable rDNA spots decreased. This means that in the course of PHA-induced cellular activation, formerly inactive NORs become transcriptionally active and tend to associate with one another. This indicates the occurrence of movements of the NORs within the nucleus, depending on their transcriptional activity." @default.
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- W1567498691 date "1986-11-01" @default.
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- W1567498691 title "On the position of nucleolus organizer regions (NORs) in interphase nuclei" @default.
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- W1567498691 doi "https://doi.org/10.1016/0014-4827(86)90219-3" @default.
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