免疫球蛋白结构域 Antigen- Light Antigen- binding site chalns binding site Antigen- Light binding site chains The chalns are joined by disulfde Antigen. bridges Heavy chains binding site Heavy chains Space-filling model Ribbon model The heavy chains and light chains This model shows domains twist around each other of B-sheets arranged like barrels(“B-barrels")免疫球蛋白结构域