Term Name:	fibrillar center
Synonyms:	fibrillar centre
Definition:	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.
Ontology:	GO: Cellular Component [GO:0001650]    QuickGO    AmiGO