About the Authors
Department of Immunology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MAB. Performed the experiments: MAB SEG. Analyzed the data: MAB. Wrote the paper: MAB. Principle investigator responsible for procuring funding: KAN. Reviewed experimental design and data analysis: KAN. Edited the paper: KAN.