Anatomy

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 & Sainsbury, Dictionary of Microbiology & Molecular Biology, 2d ed)

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

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 & Sainsbury, Dictionary of Microbiology & Molecular Biology, 2d ed)

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Synonyms

5 entry terms
  • Cell Nucleoli
  • Plasmosome
  • Nucleoli, Cell
  • Nucleolus, Cell
  • Plasmosomes

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Aspects Covered

15 allowable subheadings

Indexed with the subheadings chemistry, classification, drug effects, enzymology, genetics, immunology, metabolism, microbiology, parasitology, pathology, physiology, radiation effects, transplantation, ultrastructure, virology.

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History Note

67(65)

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Tree Number

  1. A11w.284w.430w.106w.279.345.175w

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NLM Classification

QU 350

AMA Style

References

  1. National Library of Medicine. Cell Nucleolus. Medical Subject Headings (MeSH). 2026. Unique ID D002466. http://id.nlm.nih.gov/mesh/2026/D002466
  2. Cell Nucleolus. In: Wikipedia. https://en.wikipedia.org/wiki/Nucleolus
  3. Cell Nucleolus. In: Wikidata. https://www.wikidata.org/wiki/Q30869