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Hair follicle. Coloured scanning electron micrograph (SEM) of a section through a freeze- fractured hair follicle in the skin. The follicle, in the dermis of the skin, is surrounded by connective tissue (mid-green). It produces a hair (brown strand) that protrudes above the skin's surface (top). A sebaceous gland (light blue, lower centre) secretes oily sebum onto the hair and the skin. Magnification: x100 at 6x7cm size. (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER)