1. Tuberculosis Research Section, National Institute of Allergy and Infectious Diseases; Bethesda Maryland 20892
2. Department of Chemistry; University of Cambridge; Cambridge CB2 1EW United Kingdom
3. Structural Biology Section; Research Technologies Branch, National Institute of Allergy and Infectious Diseases; Rockville Maryland 20852
4. Molecular Signaling Section, Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases; Bethesda Maryland 20892