1. Department of Oral Biology, Box 357132, University of Washington, Seattle, WA 98195, USA1
2. Bacterin Inc., Bozeman, MT 59717, USA2
3. Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA3
4. Department of Biochemistry, University of Pennsylvania School of Dental Medicine, Philadelphia, PA 19104, USA4