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Fat cells. Coloured scanning electron micrograph (SEM) of fat cells (adipocytes, red) surrounded by a network of blood vessels (strands). Adipocytes make up the fat tissue (adipose) of the body. Adipose tissue forms an insulating layer under the skin, storing energy in the form of fat, which is obtained from food. Magnification unknown. (KEYSTONE/SCIENCE PHOTO LIBRARY/NATIONAL INSTITUTES OF HEALTH/SCIENCE PHOTO LIBRARY)