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Compressive force regulates Smad4 expression in HGFs in a time-dependent manner. (A) mRNA and (B) protein expression of Smad4 in HGFs under compressive force. One-way ANOVA followed by Dunnett's post hoc test was used to analyze data. *P<0.05 vs. 0 h. HGF, human gingival fibroblast.
