Only a Tiny Fraction of Our DNA Is Uniquely Human

Only a Tiny Fraction of Our DNA Is Uniquely Human
AP Photo/Rui Vieira

The genetic tweaks that make humans uniquely human may come in small parcels interspersed with DNA inherited from extinct ancestors and cousins.

Only 1.5 percent to 7 percent of the collective human genetic instruction book, or genome, contains uniquely human DNA, researchers report July 16 in Science Advances.

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