Kono, Nobuaki http://orcid.org/0000-0001-5960-7956
Nakamura, Hiroyuki
Ohtoshi, Rintaro
Tomita, Masaru
Numata, Keiji http://orcid.org/0000-0003-2199-7420
Arakawa, Kazuharu http://orcid.org/0000-0002-2893-4919
Funding for this research was provided by:
Cabinet Office, Government of Japan
Yamagata Prefectural Government and Tsuruoka City, Japan
Article History
Received: 1 October 2018
Accepted: 3 April 2019
First Online: 29 April 2019
Competing interests
: N.H and R.O are employees of Spiber Inc., a venture company selling artificial spider silk products. However, all study design was made by Nobuaki Kono and Kazuharu Arakawa of Keio University, and Spiber Inc. had no role in study design, data analysis, data interpretation, or writing of the manuscript. The other authors declare no competing interests.