New research at the Max Planck Institute and EPFL links oxygen sensing to why frog tadpoles regrow limbs while mammals fail to do so. Some amputated limbs heal into scars. Others begin building themselves back. That split has long sat at the center of regeneration research. Salamanders and frog tadpoles can regrow lost limbs, while mammals cannot. Scientists have debated for decade... [8606 chars]
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