1. Biotechnology Division, Natick Research, Development, and Engineering Center, U.S. Army, Natick, MA 01760—5020
2. Materials Directorate, Wright Laboratory, WL/MLPJ, Wright-Patterson AFB, OH 45433—7702
3. Center for Bioengineering, University of Washington, Seattle, WA 98195
4. Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22903—2442