Fat cell. Comparison between a scanning election micrograph (SEM left) and transmission electron micrograph (TEM right) of a fat (adipose) cell. In the TEM images the fat cell or adipocyte, consists of a large central lipid droplet (purple) surrounded by a thin layer of cytoplasm (red) containing the nucleus (blue). Fat cells store energy as an insulating layer of fat under the skin. A loose framework of collagen fibres support the fat cells in adipose tissue. Magnification: x4000 when printed at 10 centimetres high. For a series of comparisons between SEMs and TEMs see images C047/7006 to C047/7034.