OpsinsRod OpsinsCone OpsinsLight Signal TransductionPhotoreceptor Cells, VertebratePineal GlandPhotoreceptor Cells, InvertebrateReflex, PupillaryLightCircadian RhythmRhodopsinPhotoperiodPhotoreceptor CellsRetinaDarknessRetinal Ganglion CellsRetinal Cone Photoreceptor CellsMicrospectrophotometryRetinaldehydeRetinal PigmentsVision, OcularCompound Eye, ArthropodRetinal Rod Photoreceptor CellsHydrozoaPhylogenyPoeciliaCichlidsColor VisionTransducinG-Protein-Coupled Receptor Kinase 1Drug Inverse AgonismButterfliesCyprinodontiformesEye ProteinsFish ProteinsCrustaceaEvolution, MolecularEyeInvertebratesMolecular Sequence Datacis-trans-IsomerasesLizardsArrestinArthropodsThyroid Hormone Receptors betaAmino Acid SequenceGene DuplicationDark AdaptationUrodelaRetinitis Pigmentosa