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Tim HuttonTim Hutton - 2012-02-15 09:28:54+0000 - Updated: 2012-02-15 09:28:54+0000
Originally shared by Carl ZimmerWe humans use a virus protein to build placentas. So do dogs. So do rabbits. So do mice. Each mammal uses a different virus. On the Loom, I blog about one of the weirder twists in our evolution.

Mammals Made By Viruses | The Loom | Discover Magazine

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