Cone OpsinsOpsinsRod OpsinsRetinal Cone Photoreceptor CellsDrug Inverse AgonismRetinal Rod Photoreceptor CellsPhenotypePhotoreceptor Cells, VertebrateTransducinRetinaldehydecis-trans-IsomerasesVision, OcularRetinal PigmentsRhodopsinRetinaGrowth ConesEye ProteinsMicrospectrophotometryLight Signal TransductionPhotoreceptor CellsMolecular Sequence DataColor VisionCompound Eye, ArthropodPhylogenyDark AdaptationElectroretinographyLightPhotoreceptor Cells, InvertebrateMutationHydrozoa