IL6 and schizophrenia: In comparison to controls, schizophrenia patients had higher levels of IL-2 (U = 1573.5, p < 0.001) and also the inflammatory cytokines IL-1β (U = 1565.5, p = 0.011), IL-6 (U = 1975.5, p = 0.018), and IFN-γ (U = 2076.0, p = 0.018) (Fig. 1).