About the Authors
Lovelace Respiratory Research Institute, Albuquerque, New Mexico, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: RCL FK. Performed the experiments: RCL TLB EBB APG. Analyzed the data: RCL WM JDM TLB EBB APG FK. Contributed reagents/materials/analysis tools: JDM APG. Wrote the paper: RCL WM FK. Pathologist: APG.