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| Dynorphins Dynorphin | Dynorphin (1-17) | Dynorphin A | Dynorphin A (1-17) A class of opioid peptides including dynorphin A, dynorphin B, and smaller fragments of these peptides. Dynorphins prefer kappa-opioid receptors (RECEPTORS, OPIOID, KAPPA) and have been shown to play a role as central nervous system transmitters. |