1. Department of Bioengineering and Therapeutic SciencesUniversity of California, San Francisco San Francisco California USA
2. Department of Pharmaceutical ChemistryUniversity of California, San Francisco San Francisco California USA
3. Department of Biochemistry and Molecular PharmacologyUniversity of Massachusetts Medical School Worcester Massachusetts USA
4. Department of Cell BiologyUniversity of Pittsburgh Pittsburgh Pennsylvania USA
5. Laboratory of Cellular and Structural BiologyThe Rockefeller University New York New York USA
6. Laboratory of Mass Spectrometry and Gaseous Ion ChemistryThe Rockefeller University New York New York USA