IFNG and post-traumatic stress disorder: IFN-γ was associated with prefrontal-limbic [11C]PBR28 VT (Supplementary Fig. 4: β = −0.64, n = 36, p = 0.046) across all participants, with an effect for interaction of group by IFN-γ level (p = 0.002) reflected in a negative association within the controls (β = −0.65, n = 20, p = 0.031) and a positive association within the PTSD group (β = 0.60, n = 16, p = 0.17) of IFN-γ with prefrontal-limbic [11C]PBR28 VT.