The purpose of this study is to gain knowledge about the result of infusing liver cells, carefully matched to blood type, into a subject's body. The hope is that this procedure will aid functions of the liver and prevent death, enable a transplant procedure to be carried out if a donated liver becomes available, and lessen complications in postoperative recovery. There is no guarantee that any of these benefits will be re eived, but even if they are not, the hope is that knowledge gained by using this procedure will be of future benefit to others who also suffer from liver disease.