These clusters, namely HLA-B, HLA-DRB1, HLA-C, HLA-DRA, HLA-DQA, HLA-DQB, HLA-DPB, have been associated with mental health disorders, i.e., SCZ, BPD, and PTSD (Carter, 2009). The gene discussed is HLA-DQA1; the disease is post-traumatic stress disorder.