1. Laboratory of Medicinal Chemistry (UAMC), Department of Pharmaceutical Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk (Antwerp), Belgium
2. Laboratory of Medical Biochemistry, Department of Pharmaceutical Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk (Antwerp), Belgium
3. Laboratory of Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk (Antwerp), Belgium
4. Institut für Molekularbiologie, Universitätsmedizin Göttingen, Humboldtallee 23, D-37073 Göttingen, Germany