title: The control of sensitivity in the retina.
mesh_terms: D000818:Animals; D008027:Light; D010786:Photoreceptor Cells / Q000166:cytology / Q000502:physiology*; D012160:Retina / Q000166:cytology / Q000502:physiology*; D012168:Retinal Pigments; D009435:Synaptic Transmission; D014562:Caudata
chemical_list: D012168:Retinal Pigments