According to [23andme's Twitter](https://twitter.com/23andMe/status/704889728810614785)

[![image of text][1]][2]

Image reads,

> Approximately 8% of DNA is originally from viruses, which infected your ancestors and became integrated into their cells.


  [1]: https://i.sstatic.net/IGrocm.jpg
  [2]: https://i.sstatic.net/IGroc.jpg