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wood prints ache wood prints analgesia wood prints antagonist wood prints biochemical wood prints biochemistry wood prints biology wood prints brain wood prints cell membrane wood prints cgi wood prints discomfort wood prints drug wood prints euphoria wood prints hallucinogenic wood prints illustration wood prints ligand wood prints

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Morphine binding to opioid receptor. Computer illustration of morphine molecules (orange) binding to mu-opioid receptors (grey) in a cell membrane (purple and yellow). Opioid receptors are found on nerve cells. When pain is detected by the body, endorphins are released and attach to the receptors, starting a reaction that modulate pain perception. Opioid drugs such as morphine mimic endorphins.