CyCD3ε+ NK cells are enriched for adaptive NK cell markers. (A) Percentages of NKG2C+, FcεRIγ−, CD57+, NKG2A+, LIR-1+, KIR2DL1/S1+, KIR2DL2/S2/L3+, and KIR3DL1+ NK cells among cyCD3ε+ NK cells and cyCD3ε− NK cells are shown. Populations from the same donors are paired. The expression of KIR2DL1/S1 is evaluated on HLA-C2+ donors and KIR2DL2/S2/L3 is evaluated on HLA-C1+ donors. (B) Linear regression analysis between cyCD3ε+ NK cell frequency and NKG2C+FcεRIγ− NK cell frequency among the CD56dim NK cell population. (C) Donors were grouped based on cyCD3ε expression and geometric mean fluorescence intensity (gMFI) of HLA-C on their lymphocytes.