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B A 27-year-old Chinese citizen found out he had AIDS.Weeks later,he was told he had acute lymphoblastic leukemia(急性淋 巴细胞白血病).But scientists offered him a ray of hope:a bone marrow transplant to treat his cancer and an extra experimental treatment to try to rid his HIV virus.This involved using the gene editing tool CRISPR-Cas9 to delete a gene known as cCr5 from bone marrow stem cells of the donor before the transplant. "After being edited,the cells-and the blood cells they pro duce-have the ability to resist HIV infection,"lead scientist Deng Hongkui said.People who carry mutated(突变的)copies of CCR5 are highly immune to HIV,because the virus uses a protein made by this gene to gain entry into an infected person's