About the Authors

Naoya Okada

Affiliation Graduate School of Biosphere Science, Hiroshima University, Higashi-hiroshima, Hiroshima, Japan

Noriaki Shimizu

shimizu@hiroshima-u.ac.jp

Affiliation Graduate School of Biosphere Science, Hiroshima University, Higashi-hiroshima, Hiroshima, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NS. Performed the experiments: NO. Analyzed the data: NO NS. Contributed reagents/materials/analysis tools: NO NS. Wrote the manuscript: NS.