JOHN BURBIDGE / SCIENCE PHOTO LIBRARY JOHN BURBIDGE / SCIENCE PHOTO LIBRARY
Human skin. Light micrograph of a section through human skin. The bottom layer seen here is the dermis, which consists of fibrous connective tissue containing nerve endings, sweat glands, hair follicles and blood vessels (at lower left, for example). Above this is the epidermis, stained pink in this sample. The cells of the epidermis are continuously pushed towards the top by cell division in the basal layer. As the cells age they harden and die, ultimately forming a protective surface (top), hardened by the protein keratin, that is worn away by abrasion. Magnification x240 at 6x9cm size.
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