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t-shirts analgesia t-shirts antagonist t-shirts biochemical t-shirts biochemistry t-shirts biology t-shirts cell membrane t-shirts central nervous system t-shirts cgi t-shirts endorphin t-shirts enkephalin t-shirts euphoria t-shirts g protein t-shirts illustration t-shirts ligand t-shirts molecular t-shirts

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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.