1 III. Department of Medicine, Division of Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. Electronic address: c.krebs@uke.de.
2 Quantitative Systems Biology, Life and Medical Sciences Institute, University of Bonn, Bonn, Germany; Platform for Single Cell Genomics and Epigenomics, German Center for Neurodegenerative Diseases and the University of Bonn, Bonn, Germany. Electronic address: andreas.schlitzer@uni-bonn.de.
3 Institute of Experimental Immunology, Rheinische Friedrich-Wilhelms-Universität, Bonn, Germany. Electronic address: ckurts@web.de.