A Mosa1, A Gerber1, J Neunzig1, Rita Bernhardt2. 1. Institute of Biochemistry, Campus B 2.2, Saarland University, 66123, Saarbrücken, Germany. 2. Institute of Biochemistry, Campus B 2.2, Saarland University, 66123, Saarbrücken, Germany. ritabern@mx.uni-saarland.de.