Ablation of kappa-opioid receptors from brain dopamine neurons has anxiolytic-like effects and enhances cocaine-induced plasticity.
Van't Veer A, Bechtholt AJ, Onvani S, Potter D, Wang Y, Liu-Chen LY, Schütz G, Chartoff EH, Rudolph U, Cohen BM, Carlezon WA. Ablation of kappa-opioid receptors from brain dopamine neurons has anxiolytic-like effects and enhances cocaine-induced plasticity. Neuropsychopharmacology. 2013 Jul; 38(8):1585-97.