Excitatory projections from the prelimbic cortex (PL) to the basolateral nucleus of the amygdala (BLA) are implicated in the regulation of anxiety‐like behaviors, and we previously demonstrated that anxiolytic‐like effects of the selective delta‐opioid receptor (DOP) agonist KNT‐127 is involved in suppressing glutamate neurotransmission in the PL. The gene discussed is OPRD1; the disease is Anxiety.