![scientists-regrow-frogs-lost-leg](https://utterbuzz.com/wp-content/uploads/2022/01/scientists-regrow-frogs-lost-leg-640x425.jpg)
Scientists have triggered long-term growth of legs in adult frogs, which are naturally unable to regenerate limbs. The frogs regrew a lost leg over months, triggered by just 24 hour exposure to a five-drug cocktail held under a bioreactor. The new legs were functional enough to enable sensation and locomotion.