Cell tracking shows that axolotl cells in a regrowing leg retain distinct roles. The amazing axolotl - legless, but never for long.Wikimedia Commons Salamanders have the ability to regrow amputated limbs – but what stops a tail growing from the stump, instead of a leg? A team of scientists are now a step closer to the answer. They studied tissue regeneration in axolotls (Ambystoma mexicanum), salamanders endemic to Mexico. The creatures heal so well because the muscle, bone and skin cells nearest to the amputation site revert into a more generic form, forming a clump of adult stem cells called...