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for opiates in the brain and these are not just the receptors for drugs like heroin and fentanyl they are the receptors for your brains natural morphine like molecules the endorphins
and the unkeflin so the fact that naloxone can block the placebo effect for pain tells us
that the placebo effect for pain is being mediated in the body by endorphins and keflins by the brain's natural morphine like molecules placebo effects are best known in the case of pain relief
Listen to native speakers pronounce “unkeflin” in real conversational contexts with synchronized timestamps and subtitles.