The Delta-Opioid Receptor (DOR) is a type of receptor in the brain and nervous system that binds to specific molecules called opioids. These receptors play a crucial role in modulating pain, mood, and emotional responses. When activated by natural or synthetic opioids, DORs can produce effects such as pain relief and feelings of euphoria. DORs are part of the larger family of opioid receptors, which also includes mu-opioid receptors and kappa-opioid receptors. Research on DORs is important for developing new pain management therapies that minimize side effects and reduce the risk of addiction associated with traditional opioid medications.