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](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/08/081518_LR_regeneration_feat.jpg?fit=860%2C460&ssl=1)
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