All is revealed in Dr Robert O Beckers book "The Body Electric" {*not* to be confused with Bob Beck} .
Further funding for his fascinating research was withdrawn due to him publishing his findings against his peers advice thus forcing him into early retirement. He died only a few years ago.
This book is a riveting read and I can't recommend it highly enough. Silver wires placed at the wound site with a current running through them promoted the release of Ag+ ions, using the blood as the electrolyte. Specific genes in the DNA dedifferentiated and reverted to cell structures specific to the tissue in need of repair.
Hunt this book down and get a copy, I guarantee you won't be sorry, and I'm sure you'll be asking yourself..."Why is his research not still continued to this very day?".