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endogenous opioid |
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endogenous opioid,
an opiate-like substance, such as an endorphin, produced by the body. opioid 1. any synthetic narcotic that has opiate-like activities but is not derived from opium. 2. denoting naturally occurring peptides, e.g. enkephalins, that exert opiate-like effects by interacting with opiate receptors of cell membranes. endogenous opioid see endorphin, enkephalin. opioid receptors specific receptor sites for opioids, named for the drugs which have a high binding affinity for them. The main ones are mu (morphine), kappa (opioid agonist-antagonists such as pentazocine) and delta (enkephalin endogenous opioids). Subtypes exist and others, such as sigma and epsilon, have been identified. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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