Skin Penetration Pathways Diagram

Clean scientific cross-section diagram of skin showing the three penetration pathways through the stratum corneum. Three labeled arrows: "Transcellular" (arrow going straight through corneocytes), "Intercellular" (arrow weaving between cells through lipid matrix), "Transappendageal" (arrow going down a hair follicle). Flat, minimal educational illustration style, warm off-white background, dark outlines and labels. Dermatology textbook style, no decorative elements.

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