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The effect of increasing concentrations of PLL-EO on the viability of human oral cells following 24 h incubation. GF: gingival fibroblasts; PDLF: periodontal ligament fibroblasts; GK: gingival keratinocytes, and DOK: dysplastic oral keratinocytes. Data (mean from six parallels in three independent experiments ± S.D.) are expressed as the percentage of viability of untreated cells (=100%).
