1. Institute of Molecular Enzyme Technology Research Centre Juelich Heinrich‐Heine‐University Duesseldorf D‐52426 Juelich Germany
2. Institut of Bio‐ und Geosciences IBG‐1: Biotechnology Research Centre Juelich D‐52426 Juelich Germany
3. Institute of Pharmaceutical Biotechnology Ulm‐University Albert‐Einstein‐Allee 11 D‐89069 Ulm Germany