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Molecular properties of the stratum corneum (SC) determined by Fourier‐transform infrared spectroscopy. (a) Total lipid, (b) lipid ester, (c) glycerol and (e) water levels relative to amide II and lipid peak centre of gravity (COG, d) by SC depth (inset graphs display mean SC or skin‐surface levels). Asterisks indicate the results of pairwise testing: **P < 0·01, ****P < 0·0001. [Colour figure can be viewed at wileyonlinelibrary.com]
