摘要
当人们由于事故或疾病失去腿时，急诊加假肢常常能使他们重新行走。但蝾螈在同样的情况下却不需要医生或是假肢，它们自己会重新长出肢体。一组英国科学家是从两个简单的观察结果开始他们对这问题的研究的：你如果在踝关节处切断蝾螈的腿。重新长出来的只是脚；而如果你把蝾螈的腿从根部切断，就会长出一整条腿。在以上两种情况下，重新生长的过程都是从干细胞开始的。
When people lose legs after accidents or illnesses, emergency care and artificial limbs often allow them to walk again. But newts in the same situation don＇t need doctors or artificial body parts. They can grow limbs back on their own.
