1. Laboratory of Cellular and Structural Biology, The Rockefeller University 1 , New York, NY, USA
2. Laboratory of Mass Spectrometry and Gaseous Ion Chemistry, The Rockefeller University 2 , New York, NY, USA
3. Laboratory of Virology and Infectious Disease, The Rockefeller University 3 , New York, NY, USA
4. Electron Microscopy Resource Center, The Rockefeller University 4 , New York, NY, USA