ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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Scanning electron microscopy (SEM) of a hair bulb. A bulbous terminal end through which nourishing capillaries enter encases the hair root of a follicle. The sebaceous gland (yellow) opens onto the hair and releases sebum, an oily secretion that lubricates the skin.
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