TG and neuroblastoma: To this end, commercial intravenous immunoglobulin (IVIG) preparations have been shown to contain multiple anti-idiotypic antibodies, such as anti-factor VIII antibodies, anti-DNA autoantibodies, anti-intrinsic factor antibodies, anti-thyroglobulin (Tg) autoantibodies, anti-neutrophil cytoplasmic antibodies, anti-microsomal antibodies, anti-neuroblastoma antibodies, anti-phospholipid antibodies, anti-platelet antibodies, anti-Sm idiotypes (ID-434), and anti-GM1 antibodies.