Acknowledgements
We thank Ms. Hiroko Katsura for tissue specimen preparation and Ms. Judith B. Gandy for providing professional English editing of the manuscript.
Declaration of interest
The authors report no conflict of interest. This work was supported in part by grants from the Amyloidosis Research Committee, the Pathogenesis, Therapy of Hereditary Neuropathy Research Committee, the Surveys and Research on Specific Disease, the Ministry of Health and Welfare of Japan; Japan Society for the Promotion of Science KAKENHI Grant numbers 26860372, 25870541, and 24249036; and the Japanese Society of Laboratory Medicine Fund for the Promotion of Scientific Research.