1. Department of Molecular Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
2. Crucell Holland BV, Archimedesweg 4-6, 2301 CA Leiden, Netherlands.
3. Central Veterinary Institute, Wageningen University, Houtribweg 39, 8221 RA Lelystad, Netherlands.
4. State Key Laboratory of Emerging Infectious Diseases and Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong, China.
5. Skaggs Institute for Chemical Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.