KIR2DL1 and acute myeloid leukemia: CD158b and CD158e1 tend to be expressed by more mature NK cells in AML than in the control group (Figures 5B,C), while CD158a and CD159a positive mature NK cells are better represented in the control group than in AML, with a statistical significant difference for CD159a (p = 0.002; Figures 5A,D).