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If you get a cut, it’ll heal. If you lose some skin to road rash, it’ll grow back. But lose a limb, and it’s gone for good. Unless you’re a salamander, a zebrafish or an axolotl, of course — all of which can regrow missing limbs. Now, scientists find that some of the molecules crucial to that process are at work inside of us.

Specific microRNA molecules are key to limb regeneration in salamanders. It turns out that similar molecules in our own bodies c