Millions of years ago, retroviruses invaded the human genome. Today some of these viral remnants threaten the developing embryo while others fight to defend it.

Read this story here.

<p>Millions of years ago, retroviruses invaded the human genome. Today some of these viral remnants threaten the developing embryo while others fight to defend it.</p>
<p>Read this story <a href="https://www.wired.com/story/an-ancient-battle-is-playing-out-in-the-dna-of-every-embryo/">here</a>.</p>

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