nucleolar organizer

(redirected from nucleolar zone)
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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.

nucleolar organizer

[no̅o̅klē′ələr]
Etymology: L, nucleolus, little nut kernel; Gk, organon, instrument, izein, to cause
a part of the nucleus of the cell, thought to consist of heterochromatin, that is responsible for the formation of the nucleolus. Also called nucleolar zone, nucleolus organizer.

nucleolar organizer

an area of nuclear DNA containing genes that code for RIBOSOMAL RNA. The area is associated with the NUCLEOLUS.