STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Hair follicle. Coloured scanning electron micrograph (SEM) of a transverse freeze-fractured section through a hair shaft (upper centre) and the follicle (circular layers) it is anchored in. The hair shaft is covered with a cuticle that contains a hard form of keratin (the protein that is found in hair). The follicle layers are an IRS (internal root sheath, pink), an ERS (external root sheath, blue) and the outermost connective tissue sheath (brown, mostly seen across the top). Magnification: x100 at 6x6cm size.
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