1. VA Portland Health Care System, Research and Development, 3710 Southwest U.S. Veterans Hospital Road, Portland, OR 97239, USA.
2. Department of Pulmonary and Critical Care Medicine, Oregon Health & Science University, 3181 Southwest Sam Jackson Park Road, Portland, OR 97239, USA.
3. Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
4. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA.
5. Oregon Health & Science University Medicinal Chemistry Core, Portland, OR 97239, USA.
6. Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA.
7. Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, OR 97239, USA.