1. Department of Bioengineering, University of California-San Diego, La Jolla, California.
2. Current location: Department of Chemistry, University of California-Irvine, Irvine, California.
3. Current location: Department of Orthopaedic Surgery, University of California-San Diego, La Jolla, California.
4. Departments of Biochemistry and Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois.
5. Whitaker Institute of Biomedical Engineering, University of California-San Diego, La Jolla, California.