About the Authors

Tetsuji Okada

tetsuji.okada@gakushuin.ac.jp

Affiliation Department of Life Science, Gakushuin University, Toshima-ku, Tokyo, Japan

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TO. Performed the experiments: TO. Analyzed the data: TO. Contributed reagents/materials/analysis tools: TO. Wrote the paper: TO.