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Epidermis

Photo: Epidermis
Seen here in a scanning electron micrograph, the epidermis is a tough coating formed from overlapping layers of dead skin cells, which continually slough off and are replaced with cells from the living layers beneath. The epidermis is the outermost of three layers that make up the skin.
Photograph by Andrew Syred/Science Photo Library

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Body: The Complete Human

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The Incredible Human Body DVD and Video

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Explore the human body from the inside out.