For histology and immunohistochemistry analysis, sections of 6 µm were made for hematoxylin/eosin staining. Immunohistochemical staining was performed as previously described 35 (link). Primary anti-DSPP (1/200; Zen Bioscience), anti-DMP1 (1/200; Santa Cruz Biotechnology), and anti-OCN (1/200; Zen Bioscience) antibodies were used. Detection of crossreacted secondary antibodies was performed using the DAB kit (Gene Tech, China). Accordingly, quantitative analysis of the staining was conducted by measuring the average optical density using the ImageJ software. At least 3 serial sections from each sample were examined, and at least 3 samples were included in each group.
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