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Scanning electron micrograph of excised rat skin: without any treatment a; after treatment with CTN b; after treatment with AR c; after treatment with AR–CTN mixture d; and viable skin excised after 12 h of treatment with AR e; CTN f; AR–CTN mixture g. White solid arrow indicates surface effect on stratum corneum, magnification is ×500, shorter scale bar is 10 μm, and longer scale bar is 20 μm
