31. Dynorphin may play a role in the inhibition of dopamine release via kappa opioid receptors . 32. This was the fourth opioid receptor to be discovered, and is still the least understood. 33. It is used in research to distinguish centrally from peripherally mediated kappa opioid receptor effects. 34. Recent investigations discovered opioid receptors on peripheral sensory neurons. 35. Her doctorate was on the biochemistry of opioid receptors . 36. The peptides studied by Erspamer have become essential to characterize the functional role of opioid receptors . 37. Like many other flavonoids, naringenin has been found to possess weak activity at the opioid receptors . 38. Semorphone is a partial agonist at ?-opioid receptors . 39. DHA has been reported to induce an increased tolerance for pain without binding to opioid receptors . 40. It is a high-antagonist of the ?-opioid receptor .
