Figure 4.

Dose–response to isopentenyl pyrophosphate (IPP). Peripheral blood mononuclear cells were incubated with medium alone, or with IPP at different concentrations. The data represent the mean value±SEM from three donors analysed, for Vγ9⁺ T-cell outgrowth, and expression of CD25 and CD69 on Vγ9⁺ T cells. Trend lines and R² values were calculated using Microsoft Excel software.