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Effect of different concentrations of L-PRF on HGFCs proliferation from day 1 to day 3. Values are presented as mean ± SD (n = 6). Significant difference was indicated by **p < 0.01 and ***p < 0.001. L-PRF: Leukocyte-Platelet Rich Fibrin; HGFCs: Human Gingival Fibroblast Cells
