Researchers can trace the family tree of individual mutations inside our cells


We all start out as a single cell. That cell divides many, many times to form the trillions of cells in an adult human body. Each of these cells has two copies of all the genes in the human genome, inherited from our biological parents. While copying the genome trillions of times, unsurprisingly, some mistakes are made. Slight genetic variations, called mutations, accumulate in our cells as we grow from a single cell to an adult.

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