1. Institute of Materials Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 Switzerland
2. York Structural Biology Laboratory Department of Chemistry University of York Heslington York YO10 5DD UK
3. Functional Nanosystems Istituto Italiano di Tecnologia (IIT) via Morego 30 Genova 16163 Italy
4. Dipartimento di Chimica e Chimica Industriale Università degli Studi di Genova Genova 16146 Italy
5. Bioengineering Institute Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 Switzerland