The skin sections were stained with the following monoclonal antimouse antibodies: MMP-1, MMP-2, IL-6, COX-2, NF-κB, Nrf-2, aquaporin, and filaggrin (Genetex, Beverly, MA, USA). The skin sections were examined under a microscope, and the protein expression was determined using Image J software, as described previously (National Institutes of Health, Bethesda, MD, USA) [38 (link)].
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