1. Department of Biochemistry of Membranes, Center for Biomembranes and Lipid Enzymology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands, Biological Sciences, Brock University, St. Catherines, Ontario, Canada, Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel, and Department of Molecular Cell Biology, Institute of Biomembranes, Utrecht University, Utrecht, The Netherlands