1. Department of Chemistry; Vanderbilt University; Nashville TN USA
2. Mass Spectrometry Research Center; Vanderbilt University, School of Medicine; Nashville TN USA
3. Department of Pathology, Microbiology and Immunology; Vanderbilt University School of Medicine; Nashville TN USA
4. Department of Biochemistry, Vanderbilt University School of Medicine; Nashville TN USA
5. Departments of Pharmacology and Medicine; Vanderbilt University School of Medicine; Nashville TN USA