UBM recipients express fewer KIRs that recognize HLA-C ligands compared to KIRs that recognize Bw4. Aliquots of donor or day +100, donor-derived recipient PBMCs were stained with 3 directly conjugated mAbs to designated KIR (DX9, KIR3DL1; EB6, KIR2DL1/2DS1; GL183, KIR2DL2/2DL3/2DS2). The means, 25th to 75th percentile ranges, and extreme values of the percentages of CD56⁺/CD3^- cells expressing KIR by flow cytometry are shown in the box plots. Results are presented for donors or recipients separated by graft type (UBM: n = 33 donor, n = 38 recipient; TCD: n = 34 donor, n = 37 recipient). P = NS between any donor groups.