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Everyday changes

The cells in our bodies are continually acquiring DNA mutations, but mostly they occur in the 'junk' DNA that has no known function. Even when a mutation occurs in a gene, it usually either doesn't change the effect of the gene or it is a gene that is not needed in that particular cell. Only rarely does a mutation have an effect by changing the outcome of a genetic instruction.

Most DNA has no known function.
Mark Pallen, Queen's University Belfast

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