I'm not sure if junk DNA was covered directly in the book. It may of been a radio interview about the book where I heard junk DNA discussed. From what I remembe

I'm not sure if junk DNA was covered directly in the book. It may of been a radio interview about the book where I heard junk DNA discussed. From what I remember a large portion of say our DNA was not understood so was considered junk but old viruses assimilated into our DNA could make up as much as 40% of us. The assimilated DNA could then act like a defence so removing it would be bad.