Opiate receptors and internal opiates.
D000818:Animals; D001921:Brain / Q000378:metabolism*; D008958:Models, Molecular; D009292:Narcotic Antagonists / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000378:metabolism; D009433:Neural Inhibition; D010455:Peptides / Q000378:metabolism; D011957:Receptors, Opioid / Q000378:metabolism; D013116:Spinal Cord / Q000378:metabolism*; D013329:Structure-Activity Relationship; D008083:beta-Lipotropin
D009292:Narcotic Antagonists; D009419:Nerve Tissue Proteins; D010455:Peptides; D011957:Receptors, Opioid; D008083:beta-Lipotropin