Brigham and Women’s Hospital and Harvard Medical School - Ann Romney Center for Neurologic Diseases, Dana-Farber Cancer Institute - Department of Cancer Biology, Brigham and Women’s Hospital and Harvard Medical School - Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital and Harvard Medical School - Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital and Harvard Medical School - Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital and Harvard Medical School - Ann Romney Center for Neurologic Diseases, Harvard Medical School - Electron Microscopy Laboratory, Dana-Farber Cancer Institute - Department of Cancer Biology and Brigham and Women’s Hospital and Harvard Medical School - Ann Romney Center for Neurologic Diseases