nucleolar organizer(redirected from nucleolar zone)
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the region of the satellites on the acrocentric chromosomes that is active in nucleolus formation.
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.