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Influence on the killer cells with various stimulation
| Group | Stimulated by | Duplication of proliferation | Killing activity |
| 1 | IL-2 alone | 2.1 | 38.5% |
| 2 | IL-2 alone after costimulation | 3.8 | 40.1% |
| with anti-CD3 mAb for 48 h | |||
| 3 | Coexistence of anti-CD3 mAb | 5.3 | 58.7% |
| and IL-2 during incubation |
