1. Laboratory of Cell Biology and Genetics, The Rockefeller University, New York, NY 10065
2. Laboratory of Mass Spectrometry and Gaseous Ion Chemistry, The Rockefeller University, New York, NY 10065
3. Department of Biochemistry and Molecular Pharmacology, New York University Grossman School of Medicine, New York, NY 10016
4. Laboratory of Molecular Electron Microscopy, The Rockefeller University, New York, NY 10065
5. HHMI, New York University Grossman School of MedicineNew York, NY 10016