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In vitro properties of the different investigated peptides, KGNOP1 (the hybrid, Dmt-D-Arg-Aba-β-Ala-Arg-Tyr-Tyr-Arg-Ile-Lys-NH2), KGOP1 (the opioid receptor agonist, Dmt-D-Arg-Aba-β-Ala-NH2), and KGNOP3 (the nociceptin receptor antagonist, Ac-Arg-Tyr-Tyr-Arg-Ile-Lys-NH2).
