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Brains are collections of nerve cells that comprise the main structure in an organism's nervous system. The brain's function is to regulate and coordinate processes distributed throughout the body of the organism that contains it.

Since a cell cannot contain a nervous system (because it would itself be a collection of many specialized cells) a cell cannot have a brain.

In some respects, a cell's nucleus performs brain-like functions. After receiving chemical messages from outside the cell and transcribing those messages according to the code represented by the cell's DNA, the nucleus can transmit messages that govern the activity of the cell by changing the chemical activity within the cell (for example, by calling for the production of certain proteins).

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12y ago

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