1. Manchester Collaborative Centre for Inflammation Research, University of Manchester, 46 Grafton Street, Manchester M13 9NT, UK.
2. Department of Structural Biology, Stanford University School of Medicine, D159, Sherman Fairchild Science Building, 299 Campus Drive West, Stanford, CA 94305, USA.
3. Basic Science Program, Frederick National Laboratory for Cancer Research, Building 560, Room 21-89, Frederick, MD 21702, USA.
4. Ragon Institute of MGH, MIT and Harvard, Cambridge, MA 02139, USA.