1. Mass Spectrometry Research Center, Vanderbilt University, Nashville, Tennessee, USA
2. Novartis Institute for Tropical Diseases, Biopolis, Singapore
3. National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
4. Departments of Chemistry, Pharmacology, and Biochemistry, Vanderbilt University School of Medicine, 465 21st Avenue South, Medical Research Building 3, Room 9160, 37232–8575, Nashville, TN, USA