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Effect of TF on MMP protein expression. MC3T3-E1 cells were subjected to 0% (control) or 12% TF for 24 hours, and the expression of MMP-1 (A), -2 (B), -3 (C), -13 (D) and -14 (E) was examined by Western blot analysis. Each bar indicates the mean ± SD from three independent experiments. **p < 0.01 (vs. control).
