FKBP5 and post-traumatic stress disorder: A large body of research has found that single nucleotide polymorphisms (SNPs) in FKBP5 are associated with a number of psychiatric disorders, including mood and anxiety disorders, PTSD, psychosis, and substance abuse disorders (Binder et al., 2008; Xie et al., 2010; Zimmermann et al., 2011; Klengel et al., 2013).