1. Silk
Materials Research Unit, National Agriculture and Food Research Organization (NARO), 1-2 Ohwashi, Tsukuba, Ibaraki 305-8634, Japan
2. Department
of Future Industry-Oriented Basic Science and Materials, Graduate
School of Engineering, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
3. Japan Synchrotron
Radiation Research Institute, 1-1 Koto,
Mikazuki-Cho, Sayo-Gun, Hyogo 679-5198, Japan
4. Center
for Materials Sciences, Philipps University of Marburg, 35032 Marburg, Germany