"Nucleolar Organizer RegionPTNCI" . "C0028609"^^ . . . . "Gene or Genome"^^ . "Nucleolar organizer regions (NORs), which are loops of DNA containing ribosomal RNA genes, have been shown to correlate with cell proliferation and malignant transformation.NCI" . "C13267"^^ . "Nucleolar_Organizer_Region"^^ . "Nucleolar Organizer Region"^^ . "Nucleolar Organizer Region"^^ . "The chromosome region which is active in nucleolus formation and which functions in the synthesis of ribosomal RNA.MSH2001" .