Affiliation: | 1. European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany;2. Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK;3. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons/ER-C3 Structural Biology, Wilhem-Johnen-Straße, 52425 Jülich, Germany |