1. Rudolf Schönheimer Institute of Biochemistry, Molecular Biochemistry Medical Faculty University of Leipzig Leipzig Germany
2. Group Protein X‐ray Crystallography and Signal Transduction Institute of Medical Physics and Biophysics Berlin Institute of Health Charité – Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin Humboldt‐Universität zu Berlin Berlin Germany
3. Laboratory of Endocrinology and Receptor Biology National Institute of Diabetes and Digestive and Kidney Diseases National Institutes of Health Bethesda MD USA