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Correlation between melatonin, MMP-9 and TIMP-1 in patients with OSCC. (A) Correlation between serum melatonin and MMP-9 levels. (B) Correlation between serum melatonin level and the MMP-9/TIMP-1 ratio. MMP-9, matrix metalloproteinase 9; TIMP-1, tissue inhibitor of metalloproteinase 1.
