Affiliation: | 1. Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130, USA;2. Department of Medicine, Washington University in St. Louis, St. Louis, MO 63130, USA;3. Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO 63130, USA;4. Center for Metabolomics and Isotope Tracing, Washington University in St. Louis, St. Louis, MO 63130, USA |