Robuta

https://pmc.ncbi.nlm.nih.gov/articles/PMC3828533/ Kappa Opioid Receptors on Dopaminergic Neurons Are Necessary for Kappa-Mediated Place Aversion - PMC Kappa-opioid receptor (KOR) agonists have dysphoric properties in humans and are aversive in rodents. This has been attributed to the activation of KORs within... kappa opioid receptors https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2022.973780/full Frontiers | Editorial: Kappa opioid receptors revealed: Disentangling the pharmacology to open up... Three families of opioid peptides, beta-endorphin, enkephalins, and dynorphins, and three families of receptors, mu (MOR), delta (DOR), and kappa (KOR), cons... kappa opioid receptors