nucleolar organizer

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Noun1.nucleolar organizer - the particular part of a chromosome that is associated with a nucleolus after nuclear division
anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure"
chromosome - a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; "humans have 22 chromosome pairs plus two sex chromosomes"
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