Reconstitution of potentially alloreactive KIR⁺/NKG2A⁻ NK cells of donor origin after haploidentical transplantation. Posttransplantation kinetics of KIR⁺/NKG2A⁻ (CD56⁺/CD3⁻) NK cell subsets versus KIR⁻/NKG2A⁺ (CD56⁺/CD3⁻) NK cell subsets of donor origin in a sample population of 10 recipients during the first 1 to 7 months after transplantation (mean ± SD) compared with values in their donors (left). KIR⁻/NKG2A⁺ cells (open triangles), KIR2DL2/3/S2⁺/NKG2A⁻ cells (open circles), KIR2DL1/S1⁺/NKG2A⁻ cells (open squares), KIR3DL1/S1⁺/NKG2A⁻ cells (closed circles).