nucleolus organizer

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nu·cle·o·lar or·ga·niz·er

the region of the satellites on the acrocentric chromosomes that is active in nucleolus formation.
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Cytogenetic and cytosystematic studies on the nucleolus organizer regions of North American cyprinid fishes.
Silver-staining and heteromorphism of chromosomal nucleolus organizer regions in North American cyprinid fishes.
The nucleolus organizer regions (NOR) in the two populations were located in the terminal region of the short arm of a subtelocentric pair (pair 27).
Nucleolus organizer regions (NORs) are located terminally on the short arms of a medium subtelocentric pair: Sequential staining allowed to identify a homologous pair, designated as chromosome pair 9, as NOR-bearing.
Controled silver--staining of nucleolus organizer regions with a protective colloidal developer: a 1-step method.