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Human Embryos Have 250-Million-Year-Old Vestiges


Human Embryos Have 250-Million-Year-Old Vestiges
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0:00 0:02:24 0:00

Evolutionary biologists know that humans have traces of DNA that go back millions of years, well before humans were human. But thanks to some amazing new high-resolution imagery, scientists can now see how that ancient DNA shows up, then disappears in early human embryos.

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