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Confocal laser scanning microscopic (CLSM) micrographs of nude mouse skin after the in vivo topical administration of 5-aminolevulinic acid (ALA) for 2, 4, and 8 hours (left image to right image) from the aqueous control (double-distilled water) (A), ALA from oil-in-water (O/W) soybean oil emulsions (W1) (B), methyl (m)ALA from the aqueous control (double-distilled water) (C), and mALA from O/W soybean oil emulsions (W1) (D).
