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cells.A man,known as the Berlin patient,became the first per-
son to be cured of HIV in the world after receiving bone marrow
transplants from donors who had the mutation naturally.
The patient agreed and the experiment was carried out in the
summer of 2017.It was the first time that CRISPR-Cas9 had
been used on a HIV patient.In early 2019,nineteen months after
the treatment was done,the acute lymphoblastic leukemia was in
complete remission (and donor cells carrying the edited
gene persisted.But there weren't enough of them to remove the
HIV virus in the patient's body.Only approximately 5%to 8%
of the patient's bone marrow cells carried the edited gene.
But Deng doesn't see this as a failure."The main purpose of
the study was to evaluate the safety and practicability of genetically
