Research Article

Retinoic Acid Signal Negatively Regulates Osteo/Odontogenic Differentiation of Dental Pulp Stem Cells

Figure 5

Blocking RA signal enhances the expression of osteo/odontogenic related factors from human DPSCs in vivo. Immunohistochemical (IHC) staining reveals expression levels of DSPP (a, b), OCN (d, e), and COL-1 (g, h). Qualitative measurements of IHC staining show expressions of DSPP (c), OCN (f), and COL-1 (i) are enhanced significantly by BMS 493 treatment. All error bars mean the SD (). and .