Interaction between µ-opioid and 5-'HT IND.1A' receptors in the regulation of panic-related defensive responses in the rat dorsal periaqueductal grey - Rangel, Marcel P.; Zangrossi Junior, Hélio; Roncon, Camila M.; Graeff, Frederico Guilherme; Audi, Elisabeth A. (Journal of Psychopharmacology, 2014)