μ-Opposing actions of the κ-opioid receptor: Trends in Pharmacological Sciences
Sex Difference in κ-Opioid Receptor (KOPR)-Mediated Behaviors, Brain Region KOPR Level and KOPR-Mediated Guanosine 5′-O-(3-[35S]Thiotriphosphate) Binding in the Guinea Pig | Journal of Pharmacology and Experimental Therapeutics
Kappa Opioid Receptor Structure Revealed, A Potential Milestone in Medication Development | National Institute on Drug Abuse (NIDA)