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NCI Dictionary of Cancer Terms


nucleus  listen  (NOO-klee-us)

  In biology, the structure in a cell that contains the chromosomes. The nucleus has a membrane around it, and is where RNA is made from the DNA in the chromosomes.

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Drawing showing a cell containing organelles, including the nucleus (contains DNA), the nucleolus, Golgi complex, mitochondria, and endoplasmic reticulum. Also shown are the cell membrane and a membrane receptor.