Dreborg, Susanne Evolution of vertebrate opioid receptors. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Oct 2008 - 15487-92 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1091-6490 Standard No.: 10.1073/pnas.0805590105 doi Subjects--Topical Terms: AnimalsChromosomesDatabases, ProteinEvolution, MolecularGene DuplicationHumansPhylogenyReceptors, Opioid--geneticsVertebrates--genetics