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Primary gingival fibroblasts viability relative to the sole growth medium (CTRL), if supplemented with 0.1% DMSO or 100 µM H2O2 and when amended with PLL-EO − H2O2 and PLL-EO + H2O2. The separation of mean values (n = 4) and standard deviation were calculated according to the Student-Newman-Keuls test at p ≤ 0.05.
