Figure 4. Influence of macrophages on NK cell cytotoxicity.

(A) Purity of NK cells used for the cytotoxicity test after contact with macrophages. The data shown represents one out of three experiments. (B) Cytotoxicity assays were determined against YAC-1 target cells at E:T ratio 1∶2, after cell-to-cell contact or in transwells with macrophages or alone (n = 3). The results for each group are expressed as means ± SEM. **p<0.01, ***p<0.001. MФ: macrophage, NK S: NK spleen, NK L: NK lung.