1. Department of Microbiology, Immunology
and Pathology, Colorado State University, Campus Delivery 1682, Fort Collins, Colorado 80523-1682, United
States
2. Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055,
United States
3. Central Instrument
Facility, Department of Chemistry, Colorado State University, Fort Collins, Colorado 80526, United States
4. Division
of Pulmonary and Critical Care Medicine, University of California, San Francisco, California 94110, United
States