Helvik J, Drivenes O, Naess T, Fjose A, Seo H. Molecular cloning and characterization of five opsin genes from the marine flatfish Atlantic halibut (Hippoglossus hippoglossus). Vis Neurosci. 2001;18:767-80 pubmed
..This work shows for the first time molecular isolation of a complete set of retinal visual pigment genes from a marine teleost and describes the first cloning of an ultraviolet-sensitive opsin type from a marine teleost. ..