Figure 2.

The effects of adenosine on the production of IL-12, TNF-α and IFN-γ by PBMC. The effect of adenosine at concentrations ranging from 0.01 to 100 μM (Con, no adenosine) on the production of IL-12, TNF-α and IFN-γ in the presence (+) or absence (−) of 100 ng ml⁻¹ IL-18. Results are expressed as the means±s.e.m. of triplicate determinations from five donors. ^##P<0.01 compared with the value for IL-18 alone. When an error bar was within a symbol, the bar was omitted.