1. Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
2. Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA
3. Magnetic Resonance Imaging and Spectroscopy Center, University of Kentucky Medical Center, Lexington, KY 40536, USA
4. Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536, USA
5. Department of Radiation Medicine, University of Kentucky, Lexington, KY 40502, USA
6. Markey Cancer Center, University of Kentucky, Lexington, KY 40502, USA
7. Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40536, USA