(CNN) – A newer, more precise form of CRISPR, known as base editing, can change a single letter (or base) of DNA at a time. Base editing was used for the first time in a 2022 clinical trial to modify the immune cells of a UK teenager after doctors exhausted all other options to treat her form of leukemia. Eight other children and two adults have gone on to receive the treatment. And last year, doctors used base editing to treat a baby born with …
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