About the Authors
Environmental Microbial Genomics Group, Ecole Centrale de Lyon, Laboratoire Ampère UMR5005 CNRS, Ecully, France
Microbial Molecular Ecology Group, Section of Microbiology, København Universitat, København, Denmark
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SJ LF SC TMV PS. Performed the experiments: SJ LF SC. Analyzed the data: SJ. Contributed reagents/materials/analysis tools: SJ LF SC. Wrote the paper: SJ LF PS.