Effect of MAPK inhibitors on cytokine-induced IFN-γ production from cultured NK cells. Data are represented as the percent of control IFN-γ production. The absolute values for the control stimulations are given in “Results.” □ indicates control; ▦, DMSO; ▨, SB203580; and ▪, SB202190. The data are representative of 3 separate experiments.