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Scott Kelly Spent a Year in Space, and Now He Has Different DNA Than His Identical Twin Brother

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  1. Scott Kelly Spent a Year in Space, and Now He Has Different DNA Than His Identical Twin Brother  Live Science
  2. NASA Twins Study Verifies Long-Term Health Effects of Space Travel  Space.com
  3. NASA study reveals 7 percent of astronaut’s genes changed after year in space  MLive.com
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