MMP9 and post-traumatic stress disorder: Of all genes assigned to the module (n = 32), four were found differentially expressed after psychotherapeutic intervention in DGE analyses (IL1R2, ABCA1, KLF9 and LRRC4) and seven were previously reported as trauma associated (MME, TREML2, MMP9, IL1R2, ABCA1, NAMPTP1 and FKBP5, a major regulator of the glucocorticoid mediated stress response, and previously associated with PTSD (49)).