1. Department of Biochemistry, Fukushima Medical University, Fukushima 960-1295, Japan
2. Department of Forensic Medicine, Fukushima Medical University, Fukushima 960-1295, Japan
3. Department of Neurology, Fukushima Medical University, Fukushima 960-1295, Japan
4. Center for Integrated Science and Humanities, Fukushima Medical University, Fukushima 960-1295, Japan
5. Laboratory of Proteolytic Neuroscience, RIKEN Center for Brain Science, Saitama 351-0198, Japan
6. Structural Glyocobiology Team, RIKEN Global Research Cluster, Saitama 351-0198, Japan
7. Department of Neurosurgery, Juntendo University, Tokyo 113-8421, Japan
8. Institute of Development, Aging and Cancer, Tohoku University, Miyagi 980-8575, Japan