Affiliation: | 1.Division of Biosciences, University College London, Institute for Structural and Molecular Biology, Darwin Building, Gower Street, London WC1E 6BT, UK and 2.Department of Biochemistry, Gene Center and Center for Integrated Protein Science Munich, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377 Munich, Germany |