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 ?
Karyotype, nucleolus organizer regions and constitutive heterochromatin in Ostrea angasi Mollusca: Bivalvia: evidence of taxonomic relationship within Ostreidae.
Silver-staining and heteromorphism of chromosomal nucleolus organizer regions in North American cyprinid fishes.