Effects of 24 h, 48 h, and 6 day continuous exposures ziram on the ATP levels in NK cells. A.) 24 h exposure of NK cells to 0.25 μM, 0.5 μM or 1 μM ziram . Results are mean±S.D. (n= 15 for 0.25 μM, 0.5 μM, and 1 μM). B.) 48 h exposure of NK cells to 0.25 μM, 0.5 μM or 1 μM ziram. Results are mean±S.D. (n=9 for 0.25 μM; n=32 for 0.5 μM and 1 μM). C.) 6 day exposure of NK cells to 0.25 μM, 0.5 μM or 1 μM ziram. Results are mean±S.D. (n=18 for 0.25 μM, 0.5 μM and 1 μM). * indicates that the decrease in ATP was statistically significant (p<0.01).