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Old 09-11-2009, 10:24 AM   #19
RickB
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The dog in the photo is supermuscular because of naturally occurring mutations that silence both versions of the myostatin gene. Called bully whippets, these dogs are rarely champion racers. However, animals with one mutated and one normal version of the gene are more muscular
than typical animals and are among the breed’s fastest racers. Credit: Stuart Isett, Polaris

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