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Viability of cells in percentage (%) as determined by the Trypan blue exclusion assay in non-irradiated and irradiated normal (N), wounded (W), diabetic (D), and diabetic wounded (DW) cells observed at 24 h (a) and 48 h (b) following irradiation at a wavelength of 660 nm with a fluence of 5 J/cm2. Data are expressed as ±SEM (n = 3). Significant probabilities compared to the non-irradiated controls are shown as ** p < 0.01 and *** p < 0.001.
