Detection of NK92 cell binding with the K562 cell by flow cytometry. NK92 cells and CFSE-labeled K562 cells were mixed at an E/T of 1:1, centrifuged at 1,000 rpm for 1 min, and incubated at 37 °C for 10 min. Then the cells were harvested, fixed, stained with PE-CD56 mAb, and analyzed by flow cytometry. One representative example is shown.