X-ray Crystal Structure of C3d: A C3 Fragment and Ligand for Complement Receptor 2 Nagar, Bhushan ; Jones, Russell G. ; Diefenbach, Russell J. ; Isenman, David E. ; Rini, James M. Abstract Publication: Science Pub Date: May 1998 DOI: 10.1126/science.280.5367.1277 Bibcode: 1998Sci...280.1277N