1. Section of Connective Tissue Biology, Department of Biomedical Engineering,The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
2. Section of Biochemistry and Molecular Biology, Departments of Orthopedic Surgery and Biochemistry, Rush University at Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612, USA
3. MRC, Immunochemistry Unit, Department of Biochemistry, University of Oxford,OX1 3QU Oxford, UK
4. Department of Public Health and Cell Biology, University of Rome `Tor Vergata', 00133 Rome, Italy