About the Authors
Department of Physiology, Dartmouth Medical School, Hanover, New Hampshire, United States of America
Department of Microbiology and Immunology, Dartmouth Medical School, Hanover, New Hampshire, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JMB DPM GAO BAS. Performed the experiments: JMB DPM BAC SY. Analyzed the data: JMB. Contributed reagents/materials/analysis tools: GAO. Wrote the paper: JMB GAO BAS.