Fig. 3.

Time course analysis of cytokine production over a 6-h period after stimulation with PPS Whole blood from five healthy, blood group O subjects was incubated at 37°C with PPS (10 μg/ml blood, sampled at 0, 3, 4·5 and 6 h and analysed for cytokine release. Unstimulated blood was used as a negative control. Results are plotted as the mean of duplicate determinations from the 8 experiments. ○ Control; ▪ IL6; • TNFα. Error bars represent the standard error of the mean