1. Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.
2. Laboratory of Cell Biochemistry and Biology, National Institute of Diabetes and Digestive and Kidney Disorders (NIDDK), National Institutes of Health, Bethesda, MD 20892, USA.
3. Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel.
4. Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.
5. Department of Systems Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.