1. Department of Pediatrics (P.M.V.), Albert Einstein College of Medicine, Bronx, New York 10461
2. Department of Biochemistry (P.M.V., L.C., R.W.G., M.J.C.), Albert Einstein College of Medicine, Bronx, New York 10461
3. Department of Anatomy and Cell Biology (M.H.K., Y.G., M.N., G.T.), State University of New York-Downstate Medical Center, Brooklyn, New York 11203
4. Metabolex Inc. (R.W.G.), Hayward, California 94545