Scott Kelly spent a year in space and when he returned, 7% of his genes were expressing themselves differently than the genes of his identical twin, Mark Kelly. This case study helps scientists understand more about __________.

Question

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The fact that Scott Kelly's genes were expressing themselves differently than his identical twin after a year in space suggests that environmental factors can impact gene expression, which is a key concept in the field of epigenetics.

Scott Kelly Spent a Year in Space and When He