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Nucleolus usually associates with chromatin (or chromosomes) at a specific site called
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Nucleolar organiser region (NOR)
Nucleolar organizer region present on chromosome helps in the reappearance of nucleolus after cell division. The number of NOR in a cell corresponds to the number of nucleoli present in the nucleus of the cell. In a human cell, NOR occurs on chromosomes 13,14,15, 21 and 22.
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