Identical twins don’t share 100% of their DNA

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Identical twins form from the same egg and get the same genetic material from their parents – but that doesn’t mean they’re genetically identical at the time of their birth.

This is because the so-called identical twins detect genetic mutations in the womb, as their cells weave new strands of DNA and then divide into more and more cells. On average, twin pairs have genomes that differ on average by 5.2 mutations that occur early in development, according to a new study.

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