blood clots too much due to increased activity of a gene called ,
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SELP. It may have been helpful to inherit the Neandertal gene in the Stone Age when closing a wound quickly was a major concern, Capra says. “It’s certainly possible that some of these Neandertal contributions were beneficial 40,000 years ago, but are not now.”
No one knows exactly when human-Neandertal interbreeding occurred or how much went on. Estimates range from around 60,
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,000 years ago or more until shortly before Neandertals disappeared about 30,
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,000 years ago (SN: 6/13/15, p. 11). Some studies have concluded that Asians’ ancestors mixed with Neandertals more than once,
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, leaving Asians with more Neandertal DNA than Europeans (SN Online: 2/12/15). In addition,
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, Asians also inherited a small amount of DNA from another extinct group of human relatives called Denisovans.
That genetic legacy was not passed along wholesale like a precious Ming vase handed down through generations. Instead, DNA was shuffled during reproduction. Families bequeathed different bits of DNA to their heirs,
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, as if each child inherited different shards of a shattered vase. If everyone’s Neandertal genetic keepsakes were glued back together,
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, there would be enough pieces to reconstruct 20 percent or more of a Neandertal’s genome.
“In a way, Neandertals survived in us,
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,” says

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