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With the exception of identical twins, how genetically unique is each human being?

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Genetically speaking, with the exception of identical twins, once a woman conceives a preborn human, the odds against her conceiving the same one again are greater than one in 10 to the 600th power. This is many times more than the number of atoms in the known universe. Likewise, identical twins have epigenetic differences that make each of them unique.

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