The relevant section:
If the idea that a virus can improve health still seems a bit far-fetched, know that viruses aren’t the only solution, though the alternatives have yet to make it through clinical trials and some are experiencing setbacks. Scientists may also use tools such as zinc-finger nucleases or Crispr. Both methods can cut a strand of DNA in two, remove a problematic base pair, and insert a new section, but neither of these methods has passed clinical trials. Sangamo BioSciences in Richmond, California, is currently testing zinc-finger nucleases as a way to interrupt a protein that HIV relies on to attack immune cells.
http://www.ibtimes.com/how-live-longer-scientists-are-pushing-make-120-new-70-1900609
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