| Sample | Condition | Effector (E) : Target (T) |
| PBMCs | 1 - positive control for NK cell cytotoxicity | 50 : 1 + IL-2 |
| 2 | 50 : 1 | |
| 3 | 25 : 1 | |
| 4 | 12.5 : 1 | |
| 5 | 6.25 : 1 | |
| 6 | T only | |
| 7 - negative control for K562 death | E only | |
| 8 - positive control for K562 death | T + Tween | |
| NK cells (purified) | 1 - positive control for NK cell cytotoxicity | 5 : 1 + IL-2 |
| 2 | 5 : 1 | |
| 3 | 2.5 : 1 | |
| 4 | 1.25 : 1 | |
| 5 | 0.625 : 1 | |
| 6 | T only | |
| 7 - negative control for K562 death | E only | |
| 8 - positive control for K562 death | T + Tween |
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