JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
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.
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