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Small intestine microvilli. Coloured scanning electron micrograph (SEM) of a section through the upper layer of the lining (mucosa) of the small intestine. The absorption of digested food occurs across this surface, which is covered with many microvilli (white, upper frame). These microscopic hair-like structures greatly increase the surface area for absorption. Magnification: x20,000 at 6x6cm size.
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