Fat cell. Coloured scanning electron micrograph (SEM) of an adipocyte (fat cell, bright green) from bone marrow tissue. Surrounding the adipocyte are granulocytes (turquoise) and macrophages (brown and frilly), which are types of white blood cell. Adipocytes store energy as an insulating layer of fat and the majority of the cell's volume is taken up by a large lipid droplet.

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