Dirk Reinhold1, Stefan Brocke2. 1. Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany. Electronic address: dirk.reinhold@med.ovgu.de. 2. Department of Immunology, University of Connecticut Health Center, Farmington, CT, 06030, USA. Electronic address: sbrocke@uchc.edu.