Victoria Gray (second from left) with children Jamarius Wash, Jadasia Wash and Jaden Wash. Now that the gene-editing treatment has eased Gray's pain, she has been able be more active in her kids' lives and looks forward to the future. "This is really a life-changer for me," she says. Victoria Gray hide caption
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beta-thalassemia
Researchers used a gene-carrying virus to fix blood stem cells that were then used to treat patients with beta-thalassemia. Power and Syred/Science Photo Library/Getty Images hide caption