Scientists and researchers are taking normal adult cells and converting them to adult stem cells also know as induced pluripotent stem cells. Kind of like biting the snake that bites you, cells that form scars in the heart after a heart attack can be reprogrammed to repair the damage caused by the heart attack.
These induced pluripotent stem cells once converted from regular somatic cells can be used to repair any kind of injury and because they come directly form the injured host it eliminates the risk of rejection. Anti-rejection drugs would no longer be necessary either.