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Levels of ω-hydroxy tetratriacontenoic sphingoshine (d18:1-ω-hydroxy C34:1) are expressed as relative peak area per epidermal protein content. The values are shown as mean ± SD (n = 8/group). *: P < 0.05 (vs. the control group). #: P < 0.05 (vs. day 0).
