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Ninety percent of Africans were found to carry a gene variation that evolved to protect them from malaria but that increases their chances of being infected with HIV; the gene also prolongs their life expectancy if they contract the virus.

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Ninety percent of Africans were found to carry a gene variation that evolved to protect them from malaria but that increases their chances of being infected with HIV; the gene also prolongs their life expectancy if they contract the virus.

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