http://www.npr.org/2012/09/26/161817096/mammalian-surprise-african-mouse-can-regrow-skin
Holy crap.. the mice can discard their skin and regrow it. You'd think it'd be a bloody mess or something.. eww..
Imagine the possibilities if they can figure out what genetics allow the mice to do this and then apply it to humans. Burn victims could regrow their own skin, including hair and cartilage. It could probably regrow noses and ears.. I would think it could even be a way to regrow hair on balding people.