Our Inner Viruses
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Did you know that there are fragments of ancient virus DNA in our DNA? Find out how they got there and why they may be relevant to current human health.
We carry about 100,000 pieces of DNA that came from retroviruses–known as endogenous retroviruses. All told, they come to an estimated 5 to 8 percent of the entire human genome. That’s several times more DNA that makes up all 20,000 of our protein-coding genes.