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2023-2024衡中同卷语文第9题答案
A 27-year-old Chinese citizen found out he had AIDS. Weekslater, 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 bonemarrow transplant to treat his cancer and an extra experimentatreatment to try to rid his hiv virus. This involved using the geneediting tool CRISPR-Cas9 to delete a gene known as ccr5 from bonemarrow stem cells of the donor before the transplant
After being edited, the cells-and the blood cells they produce-have the ability to resist hiv infection, lead scientistDeng hongkui said. People who carry mutated(突变的) copiesof CCr5 are highly immune to HIV, because the virus uses aprotein made by this gene to gain entry into an infected person