"Lee Spievack sliced off a half-inch of this finger - but with the help of doctors and a special medical powder, he grew it back"
"That powder is a substance made from pig bladders called extracellular matrix. It is a mix of protein and connective tissue surgeons often use to repair tendons and it holds some of the secrets behind the emerging new science of regenerative medicine."
http://www.cbsnews.com/stories/2008/03/22/sunday/main3960219.shtml