About the Authors

Fumihiro Kano

fkanou@pri.kyoto-u.ac.jp

Affiliations Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan, Japan Society for Promotion of Science, Chiyoda-ku, Tokyo, Japan

Masaki Tomonaga

Affiliation Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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