产品描述： Description CD4 is a 55 kD protein also known as L3T4 or T4. It is a member of the Ig superfamily, primarily expressed on most

thymocytes, a subset of T cells, and weakly on macrophages and dendritic cells. It acts as a coreceptor with the TCR

during T cell activation and thymic differentiation by binding MHC class II and associating with the protein tyrosin kinase,

lck.