AHRR and post-traumatic stress disorder: Of the 5 CpGs that associated with PTSD in any brain region from the bulk tissue, only CpGs in AHRR (cg05575921, cg21161138) appeared to differ in those with PTSD versus controls (Additional file 1: Table S9), suggesting that the other brain-based associations may be driven by other cell types, such as glia.