1. Center for Molecular Biology of Oral Diseases, University of Illinois at Chicago, Room 530E Dentistry (M/C 860), 801 South Paulina Street, Chicago, Illinois 60612; Sanofi Recherche, Ligne Hémobiologie, 195, route d'Espagne, 31036 Toulouse Cedex, France; and Department of Veterinary Medical Chemistry, Swedish University of Agricultural Sciences, Box 575, S-75123, Uppsala, Sweden