1. Department of Veterinary Medical Chemistry, Swedish University of Agricultural Sciences, Uppsala Biomedical Center, Box 575, SE-751 23 Uppsala, Sweden, Departments of Medicine and Bioengineering, University of Utah Health Sciences Center-Pulmonary Division, University of Utah, Salt Lake City, Utah 84132, and Center for Molecular Biology of Oral Diseases, University of IllinoisChicago, Chicago, Illinois 60612