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Sebaceous gland. Coloured scanning electron micrograph (SEM) of sectioned human skin, showing a sebaceous gland (blue) under the surface. This gland is associated with a hair follicle, and oils the hair with an oily substance called sebum. The skin layers seen here are, from top to bottom: the stratum corneum (flaky, pale brown), a surface layer of flattened, dead skin cells that are continuously being shed and replaced by cells from the thin epidermal layer below (red). The lowest layer (grey-brown) is the dermis, a thick layer of fibrous connective tissue that supports and nourishes the epidermis. Magnification: x50 when printed 10cm wide.
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