Affiliation: | (1) Department of Molecular Cell Biology, Sylvius Laboratory, University of Leiden, Wassenaarseweg 72, NL-2333 AL Leiden, The Netherlands;(2) Leiden Institute of Chemistry, Gorlaeus Laboratory, University of Leiden, Einsteinweg 55, NL-2333 CC Leiden, The Netherlands;(3) Astra Structural Chemistry Laboratory, S-43183 Mölndal, Sweden;(4) Department of Biology, university of Leeds, U.K |