1. Department of Bioénergétique et Ingénierie des Protéines, CNRS, IBSM, 13402 Marseille, France
2. Bioconversion Group, Agrotechnology and Food Sciences Group, WUR, P.O. Box 17, 6700 AA Wageningen, The Netherlands
3. Department of Biological Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel