title: Peptide neurotransmitters with possible involvements in pain perception.
mesh_terms: D001920:Bradykinin / Q000502:physiology; D004723:Endorphins / Q000502:physiology; D009496:Neurotensin / Q000502:physiology; D018377:Neurotransmitter Agents / Q000502:physiology*; D010146:Pain / Q000503:physiopathology* / Q000523:psychology; D010455:Peptides / Q000502:physiology*; D011957:Receptors, Opioid / Q000502:physiology
chemical_list: D004723:Endorphins; D018377:Neurotransmitter Agents; D010455:Peptides; D011957:Receptors, Opioid; D009496:Neurotensin; D001920:Bradykinin