DLG4 and post-traumatic stress disorder: In addition, the results of the immunofluorescence co‐staining show that higher levels of Homer1 and Gabra6 co‐localization in the prefrontal cortex of mice in TBI+PTSD group compared to that of the PTSD group, although PSD‐95 co‐localized with Gabra6 as well (Figure 5A).