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Nucleoli

Regions of the nucleus that synthesize ribosomal RNA.

Also: Nucleolus

Dense subnuclear structures where rRNA is transcribed, processed, and assembled with ribosomal proteins into pre-ribosomal subunits.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Dense subnuclear structures where rRNA is transcribed, processed, and assembled with ribosomal proteins into pre-ribosomal subunits.

Translation