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MMP-13 mRNA expression in the control, OVX, US and ERT groups. Each experimental group of MMP-13 mRNA was normalized against GAPDH and expressed as the percentage of control group. *P<0.05 vs. control group; #P<0.05 vs. OVX group. Values are expressed as the mean ± standard deviation. OVX, ovariectomized; US, ultrasound; ERT, estrogen replacement therapy; MMP-13, matrix metalloproteinase-13; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.
