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<p><b>Opioid peptides</b> or <b>opiate peptides</b> are <a href="page.php?w=peptide">peptide</a>s that bind to <a href="page.php?w=opioid_receptor">opioid receptor</a>s in the brain; <a href="page.php?w=opiate">opiate</a>s and <a href="page.php?w=opioid">opioid</a>s mimic the effect of these peptides. Such peptides may be produced by the body itself, for example <a href="page.php?w=endorphins">endorphins</a>. The effects of these peptides vary, but they all resemble those of opiates. Brain opioid peptide systems are known to play an important role</p><p>
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