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Cell viability and cellular density of HaCaT cells after blue or red light exposure at low or high irradiance. HaCaT cells showed a significant cell viability reduction after exposure to high-irradiance blue or red light (*** = p < 0.001, * = p < 0.05) (A). Optical microscope images confirmed that high-irradiance blue light was able to reduce HaCaT cell density (B). Scale bar = 80 µm.
