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Rosa came in with her phone already lit . A headline on the screen said gene editing would end inherited illness , and she had not even taken her coat off . Their mother was waiting for a message . Luis wanted one thing before Rosa typed it . She had to stop telling the family that he was curing people . " Read it , " she said , and held the screen up . " This is what you do . So can you help cousin Mateo ? " Luis put a printed photo on the table , between the phone and the fruit bowl . It showed a round dish with pale jelly dried at the edges . He had printed it at the lab because he knew she would ask , and he was not bringing the real dish home . " That is what I did today , " he said . " Bacteria . Not Mateo . Not a person . " Rosa stayed on her feet . " You cut genes . The article says a cut like that can fix a disease . Mateo is ill . Do not talk to me as if I cannot read . " " You can read , " Luis said . " The article is in a hurry . CRISPR is a system bacteria use against viruses . They keep a trace of a virus and use it to find that virus again . In the lab , one common version is easy to describe , and just as easy to promise too much . A guide finds a short stretch of DNA . An enzyme cuts there . The cell tries to repair the cut . People can use that repair to switch a gene off , and sometimes to change the sequence . That is the tool . It is not a sentence about Mateo getting well . " She looked at the photo . " So nothing you did today touches him . " " Nothing I did today touches him , " Luis said . " I am checking whether my guide finds the place I chose in these bacteria . If it finds that place , I learn something about the guide . I do not learn whether a person can be treated . If you tell Mum I am curing anyone , you will be giving her a sentence I will not say . " Rosa's thumb hovered over the keyboard . She deleted the draft and set the phone face down on the fruit bowl . " I will tell her you worked with bacteria , " she said , " and that you would not talk about Mateo . "
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