CD63 is a 238 amino acid, tetraspanin glycoprotein of ~40-60 kDa. CD63 is expressed by monocytes, macrophages, endothelial cells where it is a component of Weibel-Palade bodies and by a variety of cell lines. It is located intracellularly in lysosomal granules of platelets, being translocated to the surface upon activation. It may therefore be useful as a marker of platelet activation. CD63 expression is also associated with melanoma development and expression is rapidly down-regulated by progesterone in endometrial tissues.
Aviva Systems Biology总部位于加利福尼亚州圣迭戈，在中国北京设有办公室，专注于为研究需求提供多克隆和单克隆抗体、ELISA试剂盒、蛋白质和定制服务。Aviva Systems Biology生产了24,000种经过验证的多克隆抗体，并提供近20,000种ELISA试剂盒，定制实验室服务包括蛋白表达和纯化、抗体开发，以及ELISA的开发、验证和生产。Aviva Systems Biology为与独特物种和靶标相关的研究提供独特工具，研究领域包括转录因子、癌症、心血管、细胞生物学、DNA损伤和修复、表观遗传学、信号转导、细胞分化、干细胞生物学等等。
