1. Infectious and Inflammatory Disease Center and Cancer Center; Sanford Burnham Medical Research Institute; 10901 North Torrey Pines Road La Jolla CA 92037 USA
2. Sanford Burnham Graduate School of Biomedical Sciences; 10901 North Torrey Pines Road La Jolla CA 92037 USA
3. Department of Chemistry; University of Washington; Seattle WA 98195-1700 USA