JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Enkephalin binding to opioid receptor. Computer illustration of enkephalin molecules (orange) binding to delta-opioid receptors (grey) in a cell membrane (purple and yellow). Enkephalins are opioid peptides. The binding of endorphin to the delta opioid receptor leads to the activation of a G protein (bright purple) and a signal cascade that has analgesic and antidepressant effects.
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