About the Authors

Rika E. Anderson

rikander@u.washington.edu

Affiliation School of Oceanography and Astrobiology Program, University of Washington, Seattle, Washington, United States of America

Mitchell L. Sogin

Affiliation Josephine Bay Paul Center, Marine Biological Laboratory, Woods Hole, Massachusetts, United States of America

John A. Baross

Affiliation School of Oceanography and Astrobiology Program, University of Washington, Seattle, Washington, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RA JB. Performed the experiments: RA. Analyzed the data: RA JB. Contributed reagents/materials/analysis tools: RA MS JB. Contributed to the writing of the manuscript: RA MS JB.