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Do all cells have a nucleus?

Red blood cells are the only cells in the human body that do not have a nucleus. As a result, they cannot divide and so are produced in bone marrow at the rate of 140,000 per minute. They exist in the body's circulatory system for about120days before being destroyed in the liver.

Source: Trefil, James. 1001 Things Everyone Should Know About Science, pp. 19,104.

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