A. Mouse BMDC were incubated with precursor recombinant mouse IL-38 (1–152) or mouse IL-38 (3–152) for one hour followed by stimulation with LPS (10 ng/mL). After 24 hours, the supernatants were assayed for IL-6. The data are shown as mean ±SEM, *p < 0.05, n=6.B. Mouse BMDCs were incubated with precursor or 3–152 recombinant human IL-38 for one hour and then stimulated with LPS (10 ng/mL). After 24 hours, the supernatants were assayed for IL-6. The data are shown as mean ±SEM, *p < 0.05, n=5 per group. In A, the dose-escalation starts a 0.1 ng/mL and increased by a factor of 10 to 1000 ng/mL. In B, the dose-escalation starts a 0.01 ng/mL and increased by a factor of 10 to 100 ng/mL.