dynorphin
noun
dy·nor·phin
dī-ˈnȯr-fən 
: any of a group of potent opioids found in the mammalian central nervous system that have a strong affinity for opiate receptors
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“Dynorphin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/dynorphin. Accessed 30 Oct. 2025.
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