We focused on Allo C2, since KIR2DL1 displays a more stringent recognition of HLA-C allotypes, and a greater number of HLA-C1/C1 than HLA-C2/C2 leukemia blasts, in addition to the pediatric leukemia cell line NALM-16 (HLA-C1 hemizygous) were available (Table S2). The gene discussed is KIR2DL1; the disease is leukemia.