CD44 is a trans-membrane glycoprotein widely expressed on many kinds of cell from epithelial,mesenchymal,hematopoietic and mesodermal tissues.

• CD44是属于黏附因子家族的跨膜糖蛋白。它广泛表达于多种内皮细胞、间充质细胞、造血干细胞及中胚层来源的细胞和组织。