Thus, the anti-GPIb ELISPOT assay is useful for identifying patients with ITP, but its sensitivity was much inferior to that of the anti-GPIIb/IIIa ELISPOT assay, indicating that detection of anti-GPIb antibody-producing cells could not replace the anti-GPIIb/IIIa assessment in ITP diagnosis. The gene discussed is ITGA2B; the disease is autoimmune thrombocytopenic purpura.