ITGA2B and autoimmune thrombocytopenic purpura: Warner et al. reported that measurement a combination of anti-GPIIb/IIIa antibodies and anti-GPIb antibodies by MAIPA assay had a sensitivity of 66% for the diagnosis of primary ITP.8 Kuwana et al. detected circulating B cells producing platelet-specific autoantibodies by ELISPOT assay.