Univ. Prof. Dr. Margarethe Geiger Department of Vascular Biology and Thrombosis Research, Center of Physiology and Pharmacology, Medical University of Vienna, Schwarzspanierstrasse 17, 1090 Wien Margarethe Geiger is a professor of vascular physiology at the Medical University of Vienna. Her research is focused on the role of non-inhibitory serine protease inhibitors in cell signaling. Dr. Margareta Furtmüller Department of Vascular Biology and Thrombosis Research, Med. Univ. Vienna, Schwarzspanierstrasse 17, 1090 Wien, email: margareta.furtmueller@meduniwien.ac.at Dr. Felix Wahlmüller Department of Vascular Biology and Thrombosis Research, Med. Univ. Vienna, Schwarzspanierstrasse 17, 1090 Wien, email: felix.wahlmueller@meduniwien.ac.at