1. Departments of Chemistry and Molecular Biosciences, Proteomics Center of Excellence and Chemistry of Life Processes Institute, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208, United States
2. Mass Spectrometry Research Center, Department of Biochemistry, Vanderbilt University School of Medicine, 465 21st Avenue South, Nashville, Tennessee 37232, United States
3. Protein Discovery, Inc., 418 South Gay Street, Suite 203, Knoxville, Tennessee 37902, United States