Recipients of UBM transplants exhibit lower KIR expression compared to their donors than recipients of TCD transplants. Donor or day +100, donor-derived recipient PBMCs were stained with a cocktail of directly conjugated mAbs to KIR (DX9, EB6, GL183, and FES173, which stain CD158e, CD158a, CD158b, and CD158i, respectively). 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 plot. Results are presented for donors or recipients separated by graft type (UBM or TCD) or combined (ALL). P = not significant (NS) between any donor groups.