guac: "How the placenta evolved from an ancient virus https://whyy.org/segments/the-placenta-went-viral-and-protomammals-were-born/"

How the placenta evolved from an ancient virus whyy.org/segments/th...

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author

January

summary

When evolutionary biologists studied the protein involved in fusing placenta cells, it didn’t look like it came from human DNA. It looked like a virus.