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Cell viability assessed by MTT assay of keratinocytes NCTC 2544 treated with light-emitting diode blue light (LED-BL) at 5, 10, 15, 25, 45, 50, and 85 J/cm2. Each point represents mean ± SEM of three separate experiments performed in triplicate. * Significant versus untreated control, p ≤ 0.05.
