CD 항원(CD antigen)

CD antigen	MW.(kDa)	Synonyms & Properties	Leukocyte expression	Function
CD1a, b, c, d, e	43-49	MHC class I-like structure	Dendritic cells, B cells,  Langerhans cells, some thymocytes	Display of non-peptide and glycolipid antigens for T-cell responses
CD2	45-58	LFA-2, T11, E-rosette receptor; CD58 binding adhesion molecule	T cells, thymocytes, NK cells	Adhesion molecule involved in T-cell activation
CD3	γ; 25-28 δ; 20 ε; 20	T3; composed of 3 polypeptide chains: γ, δ, ε	Thmocytes, T cells, NK1-T cells	Essential role in TCR signal transduction and in cell-surface expression of the TCR
CD4	55	L3T4	MHC class Ⅱ-restricted T cells, some thymocytes, monocytes/macrophage, granulocytes	Co-receptor for MHC class Ⅱ-restricted T-cell activation; thymic differentiation marker for T cells; receptor for HIV