title: Photoreceptor evolution: ancient 'cones' turn out to be rods.
abstract: Vertebrate rod photoreceptors are thought to have evolved from cone photoreceptors only after the divergence of the jawed and jawless fishes, but this idea is questioned by new evidence that the short 'cones' of jawless sea lampreys are physiologically equivalent to rods.
authors.affiliation: Department Biology, University of Lund, Sölvegatan 35, S-22362 Lund, Sweden. Electronic address: Eric.Warrant@biol.lu.se.
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Warrant
mesh_terms: D000818:Animals; D048428:Petromyzon / Q000502:physiology*; D017785:Photons; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*; D017948:Retinal Rod Photoreceptor Cells / Q000502:physiology*