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Histological effect of CP treatment. A/T ratio of the dorsal skin of C57BL/6 mice orally treated with CP (500 mg/kg and 1000 mg/kg) for 6 weeks. NC: negative control (distilled water), PC: positive control (finasteride, 1 mg/kg); CP500: collagen peptide, 500 mg/kg; CP1000: collagen peptide, 1000 mg/kg (hematoxylin & eosin stain, 100× magnification). The arrows represent the hair follicles.
