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A woman became the third person ever to be cured of HIV, the virus that causes AIDS, after she received a stem-cell transplant that used cells from umbilical cord blood, scientists reported Tuesday (Feb. 15).

The two other people cured of HIV, Timothy Brown and Adam Castillejo, both received bone marrow transplants from donors who carried a genetic mutation that blocks HIV infection, Live Science previously reported. These transplants contained adult hematopoietic stem cells, which are stem cells that develop into all types of blood cells, including white blood cells, a key component of the immune system.

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