Update on opioid receptors.
Atcheson
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Lambert
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D000698:Analgesia; D006801:Humans; D011957:Receptors, Opioid / Q000502:physiology*; D017465:Receptors, Opioid, delta / Q000502:physiology; D017473:Receptors, Opioid, kappa / Q000502:physiology; D017450:Receptors, Opioid, mu / Q000502:physiology
D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu