1. Department of Microbiology; Immunology and Molecular Genetics; University of California; 609 Charles E. Young Dr. East 1602 Molecular Science Building Los Angeles California 90095 USA
2. Department of Biology; Indiana University Bloomington; Jordan Hall 1001 East Third Street Bloomington Indiana 47405 USA
3. Department of Chemistry; Indiana University Bloomington; 800 E. Kirkwood Avenue Bloomington Indiana 47405 USA