Olsson et al. first explored the association between KIR genes and ITP, showing that the inhibitory KIR2DL3, KIR3DL2, and KIR3DL1 are upregulated in T cells of patients in remission compared to those with active ITP [64]. The gene discussed is KIR3DL1; the disease is autoimmune thrombocytopenic purpura.