The Protein Chemistry Group, Institute of Neurobiochemistry, Witten/Herdecke University, Stockumer Str. 10, 58448 Witten, Germany. fmeereis@uni-wh.de <fmeereis@uni-wh.de>|The Protein Chemistry Group, Institute of Neurobiochemistry, Witten/Herdecke University, Stockumer Str. 10, 58448 Witten, Germany. fmeereis@uni-wh.de <fmeereis@uni-wh.de>