1. ProteoSys AG, Carl Zeiss Strasse 51, 55129 Mainz, Germany, Institute of Molecular Biosciences, Molecular Developmental Biology, Johann Wolfgang Goethe-University, Marie-Curie-Str. 9, D-60439 Frankfurt, Germany. Physical Biochemistry, Department of Chemistry, Darmstadt University of Technology, Petersenstrasse 22, D-64287 Darmstadt, Germany