1. Institute of Molecular Biology, Federal Research Institute for Animal Health, Boddenblick 5a, 17493 Greifswald-Insel Riems, Germany
2. Laboratory of Structural Biology, School of Biological Sciences, University of Auckland, Auckland, New Zealand
3. Unité de Virologie Structurale and URA 3015 CNRS, Département de Virologie, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris Cedex 15
4. Unité de Virologie et Immunologie Moléculaires, UR892-INRA, Domaine de Vilvert, 78350 Jouy-en-Josas, France
5. Intervet International B.V., P.O. Box 30, 5830 AA Boxmeer
6. Nobilon International B.V., Exportstraat 39B, P.O. Box 320, 5830 AH Boxmeer, The Netherlands