FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term dense fibrillar component ID (Ontology) GO:0001651 (Gene Ontology)
Definition A structure found in the nucleolus, which contains newly synthesized preribosomal RNA (pre-rRNA) and a collection of proteins.[ PubMed:10754561 ]
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Data ClassFieldDirect annotations
Genes (FBgn)GO_CELLULAR_COMPONENT
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 dense fibrillar component (all annotations which use CV term, excluding "NOT" statements)
     located_in | dense fibrillar component
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cellular_component
 |__cellular anatomical structure_____
nuclear lumen                         |
 |__nucleolus_________________________|
intracellular membraneless organelle  |
 |__nucleolus_________________________|
                                      dense fibrillar component  1 rec.
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Is a cellular anatomical structure
Part of nucleolus
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Synonyms
  • "pars fibrosa" BROAD
Secondary IDs
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NIF_Subcellular:sao1841764412