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Enter your PIN http://egotastic.in.net egotasticallstars.com  In Brown's case, the donor for the stem cells was part of the 1 percent of Caucasians that has a genetic mutation called delta 32 that makes them resistant to HIV. The two Boston patients' bone marrow donors did not have the delta 32 mutation.
Pedro 2019-05-23 10:14:01

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