About the Authors
Biology Department, Brookhaven National Laboratory, Upton, New York, United States of America
Mass Spectrometer Center, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, United States of America
Department of Environmental Biology, Universiteit Hasselt, Diepenbeek, Belgium
The authors have declared that no competing interests exist.
Conceived and designed the experiments: ST DvdL LN. Performed the experiments: ST AH YBZ MDW. Analyzed the data: ST DvdL AH YBZ MDW LN SM. Wrote the paper: DvdL JV SM.