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| Nucleolus Organizer Region Nucleolar Organizer | Nucleolar Organizers | Nucleolus Organizer Regions | Organizer Region, Nucleolus | Organizer Regions, Nucleolus | Organizer, Nucleolar | Organizers, Nucleolar | Region, Nucleolus Organizer | Regions, Nucleolus Organizer The chromosome region which is active in nucleolus formation and which functions in the synthesis of ribosomal RNA. |