1. Laboratory of Cell Biology and Histology, Academic Medical Center, University of Amsterdam, Meibergdreef, Amsterdam, The Netherlands
2. E.C. Slater Institute for Biochemical Research, Academic Medical Center, University of Amsterdam, Meibergdreef, Amsterdam, The Netherlands
3. Institute of Medical Biochemistry and Chemistry, University of Bari, Piazza G. Gesare, Bari, Italy