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Effect of oral administration of collagen peptide on visible skin condition and wrinkle formation in UVB-induced hairless mice. (A) Photographs of a skin surface and replica impression of the mouse dorsal skin. Scale bar = 5 mm; (B) histogram of dorsal wrinkle using a video camera and calculated image analysis. The values are shown as mean ± SEM (n = 8). ### p < 0.001 (vs. control mice). * p < 0.05 (vs. UVB-irradiated mice).
