Fig. 1.
Killing of K562 and ML-2 cells by NK cells.
K562 cells, •; ML-2 cells, ▴. Target cells were stained with DiO and coincubated with NK cells (e:t 40:1 and 20:1) for 4 hours at 37°C in 5% CO2. Dead cells were stained with PI and analyzed by flow cytometry.