All 179 adults (49 with PTSD and 130 without PTSD) who carried homozygote and heterozygote combinations of the H1 (yin) and H2 (yang) haplotypes were included in the final FKBP5 diplotypes based neuroimaging analyses (Table 1 and Supplementary Table 3). Here, FKBP5 is linked to post-traumatic stress disorder.