1. C. G. Nichols and S.-L. Shyng, Department of Cell Biology, Washington University School of Medicine, St. Louis, MO 63110, USA.
2. A. Nestorowicz and M. A. Permutt, Division of Metabolism and Endocrinology, Washington University School of Medicine, St. Louis, MO 63110, USA.
3. B. Glaser, Division of Endocrinology and Metabolism, Hadassah Medical School, Hebrew University, Jerusalem, Israel.
4. J. P. Clement IV, G. Gonzalez, L. Aguilar-Bryan, J. Bryan, Departments of Cell Biology and Medicine, Baylor College of Medicine, Houston, TX 77030, USA.