(A) SLA-1*0401, SLA-2*0901, and SLA-3*0602, which are the classical class-I SLA alleles of Haplotype Hp-16.0, and SLA-6*0101, which is a non-classical class-I SLA allele of Hp-16.0, were transfected into HEK293 parent cells, and the reactivity of X2F6 (right panels) was examined by flow cytometry (FCM). Propidium iodide (PI) positive-dead cells were avoided for the gating. PT-85A, the pan-specific MHC class-1 antibody, was used for the positive control (middle panels). (B) The species specificity was examined using swine (Hp-16.0), human, and common marmoset PBMCs. Lymphoid gate was used for the analysis. The percentages shown above the panels are the double-positive cell percentages.