Adipose tissue. Coloured scanning electron micro- graph (SEM) of the oval adipocytes (fat cells) that make up adipose connective tissue. Strands of connective tissue (red) can also be seen. Fat cells mostly consist of lipid deposits and are one of the largest types of human cells. Adipose connective tissue forms a thick insulating layer under the skin which also acts as a reserve energy store. Magnification unknown.