1. Immunoendocrinology, Division of Medical Biology, Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
2. Virology and Immunology, Department of Medical Microbiology and Infection Prevention, University of Groningen, University Medical Center Groningen, 9713AV Groningen, The Netherlands
3. Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands