Enkephalins and endorphins.
D000698:Analgesia; D000818:Animals; D001923:Brain Chemistry; D004723:Endorphins / Q000032:analysis / Q000502:physiology*; D004745:Enkephalins / Q000032:analysis / Q000502:physiology*; D006801:Humans; D007031:Hypothalamus / Q000502:physiology; D001523:Mental Disorders / Q000503:physiopathology; D051379:Mice; D009068:Movement; D011957:Receptors, Opioid / Q000502:physiology
D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid