Acknowledgement
We thank Tomoko Tanaka and Kazuaki Okada (Okayama University) for performing experiments and discussing the results. This study was supported in part by a grant from the Program of the Japan Initiative for Global Research Network on Infectious Diseases (J-GRID, JP22wm0125004) from the Ministry of Education, Culture, Sports, Science, and Technology in Japan (MEXT) and the Japan Agency for Medical Research and Development (AMED).
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