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. [More]

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