GO_term: GO:0005730   

GO:0005730	Definition	A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.
	Term	nucleolus
	Type	Cellular_component
	Child	Component (11)
	Parent	Instance_of	GO:0043232
		Component_of	GO:0005634
	Attributes_of (4)

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