261527 RagA_likeThalassiosira pseudonana
GO:0005634 GO:0005737 -
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.
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.