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Selected ion heat maps of (A) BZK in water, (B) water, (C) Solution 1, (D) Solution 2, (E) BZK + citric acid (pH 4.7), (F) BZK + caprylyl glycol, (G) BZK + vitamin E. The ion m/z 304.30 is shown in red and ion m/z 332.33 in blue. All yellow scale bars represent 2 mm. Skin is oriented with epidermis on the right side. Dotted lines are the selected regions of interest drawn along the edges of the skin.
