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Cell Nucleolus

Within most types of eukaryotic CELL NUCLEUS, a distinct region, not delimited by a membrane, in which some species of rRNA (RNA, RIBOSOMAL) are synthesized and assembled into ribonucleoprotein subunits of ribosomes. In the nucleolus rRNA is transcribed from a nucleolar organizer, i.e., a group of tandemly repeated chromosomal genes which encode rRNA and which are transcribed by RNA polymerase I. (Singleton and Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)

Year introduced: 1967(1965)

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Subheadings:

Tree Number(s): A11.284.430.106.279.345.175

MeSH Unique ID: D002466

Entry Terms:

  • Plasmosome
  • Plasmosomes
  • Cell Nucleoli
  • Nucleoli, Cell
  • Nucleolus, Cell

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