Galápagos giant tortoises can weigh well over 300 pounds and often live over 100 years. So what's the secret to their evolutionary success? A new study concludes that compared with other turtles, these animals evolved to have extra copies of genes -- called duplications -- that may protect against the ravages of aging, including cancer. Laboratory tests on Galápagos giant tortoise cells corroborate the idea that the animals have developed such defenses.
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