A membrane-bounded organelle of eukaryotic cells that contains the chromosomes. It is the primary site of DNA replication and RNA synthesis in the cell.
A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
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