The panicolytic-like effect of fluoxetine in the elevated T-maze is mediated by serotonin-induced activation of endogenous opioids in the dorsal periaqueductal grey - Roncon, Camila M.; Biesdorf, Carla; Santana, Rosangela G.; Zangrossi Junior, Helio; Graeff, Frederico Guilherme; Audi, Elisabeth A. (Journal of Psychopharmacology, 2012)