This is an excerpt from this year's edition of Bloomberg's 50 Most influential people.
"One is viruses known as PERVs. PERVs reside in the pig genome and can integrate into the human genome. In 2015 we showed that we could use Crispr gene editing to eradicate 62 PERVs in pig cells. But one of the biggest questions was whether the PERVs played a crucial function in the pig. For the first time, in 2017, we answered the question: They’re dispensable." - Luhan Yang
You can't make things up sometimes.