क्रोमोजोम इज कॉल्ड न्यू क्लियर ऑर्गेनाइजर
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Nucleolus organizer regions (NORs) are chromosomal regions crucial for the formation of the nucleolus.
In humans, the NORs are located on the short arms of the acrocentric chromosomes 13, 14, 15, 21 and 22, the genes RNR1, RNR2, RNR3, RNR4, and RNR5 respectively.
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