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Nucleolus organizer region

A region of a chromosome where nucleoli form during interphase, and where genes encoding the largest rRNA precursor transcript are tandemly arrayed.

Pronunciation
/ˌnjuːklɪˈəʊləs ˈɔːɡənʌɪzə ˈriːʤən/
/ˌnjukliˈoʊləs ˈɔrɡəˌnaɪzər ˈriʤən/
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