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False-colour scanning electron micrograph (SEM) of the surface of human skin, showing 2 hairs penetrating the outer layer of squamous cells that comprise the epidermis. The hairs are covered by a modified cellular layer called the cuticle of the hair: these cells are highly flattened & partially overlap one another. The epidermal cells are composed of the protein keratin, which provides a tough uninterrupted covering over the body surface; keratin serves as a waterproofing material & is impermeable to many disease organisms Magnification: X 160 at 35mm size.
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