nucleus
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- n a part of the cell containing DNA and RNA and responsible for growth and reproduction
- n the positively charged dense center of an atom
- n a small group of indispensable persons or things
- n (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
- n any histologically identifiable mass of neural cell bodies in the brain or spinal cord
- n the central structure of the lens that is surrounded by the cortex
- While most of a mammal's DNA resides in the nucleus, there's also some in the mitochondria.
- In nuclear transfer, stem cells are created by inserting the nucleus from a donor's cell, usually a skin cell, into an egg cell, whose DNA-containing nucleus has been removed.
- Having two protons and one electron in its nucleus, it is twice as heavy as the previously known hydrogen, whose nucleus has one proton.