Features of nucleus-DAPI stain on UVA-irradiated HaCaT cells. Figures 9-a, -b: Distributional expressions of nucleus-DAPI stain (blue) in HaCaT cells that were irradiated with UVA ray and were administered with RW or HW, respectively. Figures 9-c, -d: The relative fluorescence intensity and the pseudocolor feature for type-I collagen were plotted using ImageJ. Magnification: ×200; scale bars = 200 μm. Student’s t-test, *** p < 0.001.