1. Secretion Biology Laboratory, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi 371-8512, Japan
2. Department of Neurosurgery, Gunma University Graduate School of Medicine, Maebashi 371-8512, Japan
3. Department of Environmental Engineering Science, Graduate School of Science and Technology, Gunma University, Kiryu 376-8515, Japan
4. Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu 376-8515, Japan