Decreased methylation at FKBP5 has also been identified in blood cells of adults who had experienced childhood trauma (36), in blood cells of Holocaust survivors with Post-Traumatic Stress Disorder (PTSD) and their offspring (37), and in buccal epithelial cells of adolescents who experienced early-life institutionalization in Romania (38). This evidence concerns the gene FKBP5 and post-traumatic stress disorder.