A study published in Pharmacological Research reveals the oligomeric molecular structure of the MOR-Gal1R complex, a component present in the brain which is involved in the analgesic and addictive effects of certain opioids. The study includes the participation of the experts Vicent Casadó, Estefanía Moreno and Verònica Casadó-Anguera, from the Molecular Neuropharmacology Research Group of the Faculty of Biology and the Institute of Biomedicine of the University of Barcelona (IBUB).