1. Molecular Pathogenesis Program, Skirball Institute of Biomolecular Medicine and
2. Howard Hughes Medical Institute, New York University School of Medicine, New York, NY 10016, USA.
3. Department of Biochemistry and Molecular Biophysics and
4. Howard Hughes Medical Institute, Columbia University, New York, NY 10032, USA.
5. Faculty of Medicine, Department of Cell Biology and Immunology, Vrije Universiteit, 1081 BT Amsterdam, Netherlands.