Fig. 2From: Role of the T and B lymphocytes in pathogenesis of autoimmune thyroid diseasesSchematic representation of Treg cell structure. CD25, cluster of differentiation 25; CD4, cluster of differentiation 4; CTLA-4, cytotoxic T cell antigen 4; OX-40, tumor necrosis factor receptor superfamily, member 4; 4-1 BB, tumor necrosis factor receptor superfamily member 9; GITR, tumor necrosis factor receptor superfamily member 18Back to article page