A small nucleus located inside another nucleus, found within certain cells.
From Greek 'endo-' (within) + Latin 'nucleolus' (small nucleus). The term combines the prefix indicating internal location with the diminutive form of nucleus, reflecting the discovery of nested nuclear structures in early microscopy.
Some organisms have nuclei within nuclei—it's like biological Russian nesting dolls! This phenomenon challenged scientists' understanding of cell organization and reminded them that nature often creates layers of complexity within complexity.
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