背景资料:CD57 represents a 110 kDa oligosaccharide antigenic determinant present on a variety of polypeptides, lipids, and chondroitan sulfate proteoglycans. It is expressed on 7-35% of normal peripheral blood lymphocytes, including subsets of NK cells and CD8+ T lymphocytes. The carbohydrate is expressed on various cell adhesion molecules in the nervous system and is suggested to play a role in cell–cell and cell–substrate interactions.