AUTHOR CONTRIBUTIONS
Hiroshi Fukayama and Ryutaro Morita designed the research. Naoki
Shibatani, Hirofumi Miyagawa, Aiko Koudou, Hiroshi Fukayama, and Ryutaro
Morita performed the experiment with the help from Yasuo Yamauchi,
Daisuke Matsuoka, Daisuke Sasayama, Tomoko Hatanaka, and Tetsushi Azuma.
Hiroshi Fukayama, Naoki Shibatani, Hirofumi Miyagawa, Aiko Koudou,
Ryutaro Morita, and Daisuke Matsuoka analyzed the data. Hiroshi Fukayama
supervised the research. Hiroshi Fukayama wrote the manuscript.