Aided by stem cells, a lizard regenerates a perfect tail for first time in more than 250 million years

Lizards can regrow severed tails, making them the closest relative to humans that can regenerate a lost appendage. But in lieu of the original tail that includes a spinal column and nerves, the replacement structure is an imperfect cartilage tube. Now, a study describes how stem cells can help lizards regenerate better tails. https://www.sciencedaily.com/releases/2021/10/211014141958.htm