If the results of a new genetic study underway at the University of Minnesota can be duplicated in humans, diseases such as sickle cell anemia and hemophilia may soon be a thing of the past. For the first time, U-of-M scientists say they have successfully repaired a gene that causes a deadly liver disease. Dr. Clifford Steer is leading the study. He says researchers developed a technique that allows them to go into a cell with a single defect and essentially re-write its genetic code.