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Unnatural Selection: Muscles, Genes and Genetic Cheats

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Can specific genes cause muscles to grow faster or stronger, and can genetic tampering give athletes an unnatural edge?

Take a close look at the athletes competing in this year's Summer Olympic Games in London—their musculature will tell you a lot about how they achieved their elite status. Endless hours of training and commitment to their sport played a big role in building the bodies that got them to the world's premier athletic competition. Take an even closer look—this one requires microscopy—and you'll see something else, something embedded in the genetic blueprints of these young men and women that's just as important to their success.

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