About the Authors
Laboratory of Neurochemistry, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: TP RF HG. Performed the experiments: TP RF OR YS DL. Analyzed the data: TP RF OR HG. Contributed reagents/materials/analysis tools: TP RF YS. Wrote the paper: HG RF OR TP.