Quantitative PCR using specific primers (Table S1) and statistical analyses using the Graph Pad Prism 8 (GraphPad Software, San Diego, CA, USA) were performed as described in a previous report [37 (link)]. Scanning electron microscopy (SEM) using a HITACHI S-4300 microscope was operated at 5 keV (the detector features 1280 × 960 pixel) as basically reported in our previous study [37 (link)]. For estimation of the statistical difference between study groups, the Student’s t-test for two group comparison or one-way ANOVA followed by a Tukey’s multiple comparison test were used.
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