1. Faculty of Science and Technology, Division of Molecular Science, Gunma University, Kiryu, Gunma 376‑8515, Japan
2. Gunma Sericultural Technology Center, Maebashi, Gunma 371‑8570, Japan
3. Transgenic Silkworm Research Center, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305‑8634, Japan
4. Department of Otolaryngology‑Head and Neck Surgery, Gunma University Graduate School of Medicine, Maebashi, Gunma 371‑8511, Japan