nucleolus organizer region

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nu·cle·o·lus or·ga·niz·er re·gion

an arrangement of the DNA coding for the production of ribosomal RNA (rRNA).
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References in periodicals archive ?
Controlled silver-staining of nucleolus organizer regions with a protective colloidal developer: A 1-step method.
Kucukdumlu, "Variation in the nucleolus organizer regions (NORs) in two mole rat species (Spalax leucodon and Spalax ehrenbergi)" Turkish Journal of Biology, vol.
The characterization of Ostrea denselamellosa (Mollusca, Bivalvia) chromosomes: karyotype, constitutive heterochromatin and nucleolus organizer regions. Aquaculture 97:317-325.