Three Skin Penetration Pathways Diagram

A clean scientific educational diagram showing three skin penetration routes side by side. Three vertical cross-section columns labeled: "Transcellular" (arrow going straight through stacked cells), "Intercellular" (arrow weaving between cells through lipid channels), "Transappendageal" (arrow going down a hair follicle). Flat minimal illustration style, beige/white background, clear labels and arrows. No photography. Scientific textbook style.

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