1. Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
2. Center for Nanoscience, Ludwig-Maximilians University, 80539 Munich, Germany
3. Biohybrid Materials, Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, 00076 Aalto, Finland