FIG. 5.
Bioassays of the pro- and mature IL-18 cleaved products. NKO cells were stimulated with proIL-18 (A) and mature IL-18 (B) that was cleaved, uncleaved, or cleaved in the presence of inhibitor (E-64) samples at concentrations shown under the horizontal axis in the presence of IL-12 (0.5 to 1.0 ng/ml). After 24 h, IFN-γ was measured at the concentration shown to the left of the vertical axes. The data represent means ± standard errors of the means (n = 3).