1. Departments of *Biochemistry and Molecular Biology and
2. Internal Medicine, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58202;
3. Department of Oral Biology, Korea 21 Project for Medical Science, Yonsei University College of Dentistry, Seoul 120-752, Korea;
4. Department of Dermatology, Mayo Clinic College of Medicine, Rochester, MN 55905;
5. Department of Functional Genetics of Epithelial Diseases, Institut National de la Santé et de la Recherche Médicale U563, 31024 Toulouse Cedex 3, France; and
6. Secretory Physiology Section, Gene Therapy and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892