About the Authors
Pacific Northwest National Laboratory, Richland, Washington, United States of America
Oregon Health & Science University, Portland, Oregon, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JEM HS KJ RT AS. Analyzed the data: JEM ML KBV SLS MPSP. Contributed reagents/materials/analysis tools: KBV SLS MPSP. Wrote the paper: JEM HS KJ KBV.