= Nucleolus
{disambiguate=biology}
= Cell nucleolus
{synonym}
The <cell nucleolus> is a region inside a <cell nucleus> without a surrounding membrane, where much <ribosomal RNA> is made and processed and <ribosome> subunits begin to assemble with <proteins>. The subunits are exported to the <cytoplasm>; the <cell nucleolus> is not itself a translating <ribosome>. See https://openstax.org/books/biology-2e/pages/4-3-eukaryotic-cells[Clark, Douglas and Choi, Biology 2e, 4.3: nucleolus and ribosomal subunits].
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