title: Observations on the radiation of lobe-finned fishes, ray-finned fishes, and cartilaginous fishes: phylogeny of the opioid/orphanin gene family and the 2R hypothesis.
authors.affiliation: Department of Biological Sciences, University of Denver, Denver, CO 80210, USA. rdores@du.edu
authors.forename: Robert M
authors.initials: RM
authors.lastname: Dores
authors.forename: Qais
authors.initials: Q
authors.lastname: Majeed
authors.forename: Leanne
authors.initials: L
authors.lastname: Komorowski