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This DNA variant causes sickle cell anemia. But not with the same severity for everyone. Why?

This DNA variant causes sickle cell anemia. But not with the same severity for everyone. Why?

Some people inherit two copies of the exact variant behind sickle cell anemia and experience much milder symptoms of the disease. 23andMe scientist Ruth explains the hidden genetic phenomenon happening in some bodies, and how it's already inspired real treatments. This is part 2 of our Genetic Escapers series.

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