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They applied crispr to bone marrow. Extract it, apply crispr. Cleanse the body to remove existing one and apply modified barrow.

Basically an auto transplant with marrow

I wonder if that can be used as a treatment in conjunction with finding the gene that gives some people immunity to HIV

That is being tried, and worked well on one patient it seems, and a second more recent one: https://www.nature.com/articles/d41586-019-00798-3