Institute of Technical Biochemistry, University of Stuttgart, Allmandring 31, D-70569, Germany. mf2355@columbia.edu <mf2355@columbia.edu>|Institute of Technical Biochemistry, University of Stuttgart, Allmandring 31, D-70569, Germany. mf2355@columbia.edu <mf2355@columbia.edu>|Institute of Technical Biochemistry, University of Stuttgart, Allmandring 31, D-70569, Germany. mf2355@columbia.edu <mf2355@columbia.edu>|Institute of Technical Biochemistry, University of Stuttgart, Allmandring 31, D-70569, Germany. mf2355@columbia.edu <mf2355@columbia.edu>