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Sickle Cell Anemia is prevalent in African countries due to the anti-Malarial properties of the sickle shaped cell, Cystic Fibrosis is more prevalent in people of Northern European descent, does it or did it have a medical benefit at one point?

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Sickle Cell Anemia is prevalent in African countries due to the anti-Malarial properties of the sickle shaped cell, Cystic Fibrosis is more prevalent in people of Northern European descent, does it or did it have a medical benefit at one point?	94