Light micrograph of adipocytes (fat cells) stained by immunohistochemistry, a technique where antibodies detect specific proteins in tissue by attaching to them and giving off a certain colour. Here, the antibody used detected the protein vimentin, a protein commonly present in most cell types. The brown colour of the stain highlights the membranes of the fat cells. The fat cells themselves are mostly made up of the white spaces which is where lipids (fat) is normally stored. Haematoxylin and eosin stained tissue section. Magnification: 200x when printed at 10cm.