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UVB-induced inducible nitric oxide synthase (iNOS) and COX-2 expression levels in human fibroblasts. Significant difference versus nonirradiation group: ##, p < 0.01; ###, p < 0.001. Significant difference versus nontreatment group: *, p < 0.05; **, p < 0.01; ***, p < 0.001.
