About the Authors
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
Trudeau Institute, Saranac Lake, New York, United States of America
Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SEG SC-CH EJP. Performed the experiments: SEG. Analyzed the data: SEG SC-CH EJP. Wrote the paper: SEG EJP. Performed the caspase 3 experiment: SC-CH.