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They have already altered an inherited retinal cancer gene, that unfortunately had an additional higher risk of leukemia later down the road for those children.
They created a virus, inserted the proper genetic material to go in and replicate and replace the damaged DNA. It worked! But they later found out there must be another gene working in conjunction with it to have caused the leukemia - that was never a risk factor before with those children. They had to scrap the administration of the virus until they can find out what the other peice of the puzzle is.
It's intensely incredible what they are on the verge of doing.
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