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Fat cells. Coloured scanning electron micrograph (SEM) of several adipocytes (fat cells). Adipocytes form an insulating layer of fat in the body to store energy. The majority of a fat cell volume is taken up by a large lipid (fat or oil) droplet. Fat accumulation starts with a few small lipid droplets which coalesce to make one large droplet. When mature, the adipocyte may be 10 or 20 times its original size.
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