Although several genes in the study, such as FKBP5 (Binder et al., 2008) and major histone compatibility Class II (Chauhan et al., 2003), had previously been linked to PTSD or other stress-related outcomes, the gene showing the largest difference in expression was mannosidase, alpha, class 2C, member 1 (MAN2C1), a locus that had not previously been linked to PTSD. MAN2C1 distinguishes between thos