JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
CD2 cell adhesion molecule. Computer graphic of the T-lymphocyte (white blood cell) antigen "CD2", a complex glycoprotein molecule important in the immune response. One CD2 molecule (red) is seen bound to a second CD2 molecule (green). Complex sugars (oligosaccharides, yellow) comprise part of the structure. CD2 molecules occur at sites on the T-lymphocyte cell membrane. These molecules allow the T-lymphocyte to stick (adhere) to other cells that are infected with foreign invaders, such as viruses, while it kills them. CD2 is the first cell adhesion molecule (CAM) to have its structure determined. CAM's may prove useful in treatments for cancer, arthritis, and multiple sclerosis.
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