KIR2DL1 and acute myeloid leukemia: However, in terms of expression level, the situation was slightly different, with higher levels of CD158e1 (p = 0.008) and CD159a (p = 0.006) on hypermature NK cells in AML (Figures 5E,G,H), while the expression of CD158a and CD158b were not significantly changed (Figure 5F).