Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.|Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.|Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.|Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.|Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.|Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.|Department of Medicine, Division of Gastroenterology and Hepatology, and Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California, United States of America.|Faculty of Engineering, Bar Ilan University, Ramat Gan, Israel.|Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.