(C-F) (C) NK92-NKp46low, (D) NK92-NKp46high, (E) YTS KIR2DL1 and (F) K562 cells were incubated with 50 µg rhodamine-labeled NPs and analyzed using confocal microscopy. Upper panel shows wide field images. Lower panel shows single-cell images. The data shown are representative of three independent experiments. 