Scientists study salamanders and their ability to regenerate lost legs and tails. What additional information is essential for scientists to understand in order to apply this ability to humans who have lost limbs?

Scientists need to identify which genes control salamander regeneration so they can investigate whether similar genes or mechanisms could help humans regrow lost limbs. Knowing how quickly regeneration happens or which body parts are often lost does not explain how regeneration works. The best answer is “which genes control regeneration.”

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