How salamanders can regrow nearly complete tails but lizards can’t

Neural stem cells in the spinal cord prevent the reptiles from regenerating nerve cells

an axolotl and a green anole

TAIL TROUBLE  Salamanders such as the axolotl (above) can regrow nearly perfect tails, including missing nerve cells. Lizards such as the green anole (below) can’t. 

From top: Kuttelvaserova Stuchelova/Shutterstock; Holly Guerriox/iStockphoto

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