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From Self-sufficiency
- ...the body's μ-opioid endorphin system, delivering pain relief via the same receptor mechanism as morphine.{{citation needed|date=September 2015}} ...uggest it functions to produce withdrawal symptoms by competing for opiate receptor sites within the CNS (a competitive antagonist, not a direct agonist), ther33 KB (4,541 words) - 09:57, 17 June 2016