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Figure S4. Influence of cognate HLA class I on KIR expression. KIR expression parameters, [%NK cells] in A and [mfi] in B, are compared between donors of the same KIR genotype, but distinguished by the number of HLA class I ligands. “High” and “Low” refer to 3DL1 allotypes binding high and low amounts of DX9 antibody, respectively. Significance of differences between groups with or without cognate ligand was tested using two-tailed Mann-Whitney’s U-test. *, P