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Two faces for an opioid peptide—and more receptors for pain research

A new study reports the cloning of a family of 'orphan' G-protein-coupled receptors that are localized in human and rat small sensory neurons. These receptors are activated by a peptide derived from preproenkephalin A and may be involved in modulating nociception.

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Figure 1: Schematic diagram of pain pathways from the periphery to the CNS.

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Simonin, F., Kieffer, B. Two faces for an opioid peptide—and more receptors for pain research. Nat Neurosci 5, 185–186 (2002). https://doi.org/10.1038/nn0302-185

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