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fibrillar center (GO:0001650)
A structure found most metazoan nucleoli, but not usually found in lower eukaryotes; surrounded by the dense fibrillar component; the zone of transcription from multiple copies of the pre-rRNA genes is in the border region between these two structures.
General
nucleolar part (GO:0044452)
References
gene ontology: GO:0001650
PMID: 10754561