Figure 1.

Release of interleukin-8 (IL-8) in cell culture supernatants after interferon-gamma (IFN-γ) pretreatment. Data are shown as individual points, the line represents the median. Black symbols = no IFN-γ pretreatment, open symbols = IFN-γ pretreatment. P values reaching statistical significance are marked on the graph. * = P < 0.05; ** = P < 0.01.