DRD1 and post-traumatic stress disorder: Drd1a genes were significantly downregulated in the PTSD-midazolam group compared to the nonstressed-midazolam + L-theanine group concurrent with the results of another study exploring the effects of stress on the mouse prefrontal cortex transcriptome, demonstrating a deregulation of the Drd1a gene in chronic mild stress exposed subjects [36].