Investigations Eighteen Years and $250 Million Later, Human Limb Regrowth Is Still a Salamander Trick
A Northeastern lab showed exactly how an axolotl rebuilds an arm from the shoulder down, and humans carry the same genes. We can still regrow a lost fingertip as children. Everything past that we heal by scarring over, and $250 million of Pentagon money has not changed the math.
By Lena Marshall · August 16, 2026