Some of these genes and their functions are noteworthy for future PTSD studies, including G0S2 (lipid metabolism, downregulated in response to stress), APBA1/2 (protein transportation and synaptic function in brain tissue), CHST11(extracellular signaling and neuronal plasticity in brain tissue), and AHRR (xenobiotic metabolism) [29]. The gene discussed is AHRR; the disease is post-traumatic stress disorder.