Why Salamanders Can Regrow Limbs (But You Can't)

Scientists discovered that oxygen sensing determines whether animals can regenerate lost limbs. When a salamander loses a leg, its cells detect the oxygen drop and trigger full regeneration. In mammals, the same signal causes scarring instead. Researchers found the exact protein pathway controlling this switch — and when they blocked the mammalian oxygen sensor in mouse tissue, the cells began showing early regeneration responses. This could be the key to future limb regrowth therapies for humans.

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